feat: Agent Dreaming Mode — idle background reflection loop (#1019)

- Add src/timmy/dreaming.py with DreamingEngine: rule synthesis from
  session logs during idle periods with configurable wake/sleep thresholds
- Add src/dashboard/routes/dreaming.py with REST endpoints for
  dreaming status, history, and manual trigger
- Add dreaming_status.html partial template for HTMX polling
- Wire dreaming_router into dashboard app
- Add dreaming CSS styles to mission-control.css
- Add dreaming_enabled/dreaming_idle_threshold_s config settings
- 17 unit tests all passing

Fixes #1019

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/config.py

@@ -311,6 +311,14 @@ class Settings(BaseSettings):
     thinking_memory_check_every: int = 50  # check memory status every Nth thought
     thinking_idle_timeout_minutes: int = 60  # pause thoughts after N minutes without user input
 
+    # ── Dreaming Mode ─────────────────────────────────────────────────
+    # When enabled, the agent replays past sessions during idle time to
+    # simulate alternative actions and propose behavioural rules.
+    dreaming_enabled: bool = True
+    dreaming_idle_threshold_minutes: int = 10  # idle minutes before dreaming starts
+    dreaming_cycle_seconds: int = 600           # seconds between dream attempts
+    dreaming_timeout_seconds: int = 60          # max LLM call time per dream cycle
+
     # ── Gitea Integration ─────────────────────────────────────────────
     # Local Gitea instance for issue tracking and self-improvement.
     # These values are passed as env vars to the gitea-mcp server process.

src/dashboard/app.py

@@ -58,6 +58,7 @@ from dashboard.routes.three_strike import router as three_strike_router
 from dashboard.routes.tools import router as tools_router
 from dashboard.routes.tower import router as tower_router
 from dashboard.routes.voice import router as voice_router
+from dashboard.routes.dreaming import router as dreaming_router
 from dashboard.routes.work_orders import router as work_orders_router
 from dashboard.routes.world import matrix_router
 from dashboard.routes.world import router as world_router
@@ -250,6 +251,36 @@ async def _loop_qa_scheduler() -> None:
         await asyncio.sleep(interval)
 
 
+async def _dreaming_scheduler() -> None:
+    """Background task: run idle-time dreaming cycles.
+
+    When the system has been idle for ``dreaming_idle_threshold_minutes``,
+    the dreaming engine replays a past session and simulates alternatives.
+    """
+    from timmy.dreaming import dreaming_engine
+
+    await asyncio.sleep(15)  # Stagger after loop QA scheduler
+
+    while True:
+        try:
+            if settings.dreaming_enabled:
+                await asyncio.wait_for(
+                    dreaming_engine.dream_once(),
+                    timeout=settings.dreaming_timeout_seconds + 10,
+                )
+        except TimeoutError:
+            logger.warning(
+                "Dreaming cycle timed out after %ds",
+                settings.dreaming_timeout_seconds,
+            )
+        except asyncio.CancelledError:
+            raise
+        except Exception as exc:
+            logger.error("Dreaming scheduler error: %s", exc)
+
+        await asyncio.sleep(settings.dreaming_cycle_seconds)
+
+
 _PRESENCE_POLL_SECONDS = 30
 _PRESENCE_INITIAL_DELAY = 3
 
@@ -410,6 +441,7 @@ def _startup_background_tasks() -> list[asyncio.Task]:
         asyncio.create_task(_briefing_scheduler()),
         asyncio.create_task(_thinking_scheduler()),
         asyncio.create_task(_loop_qa_scheduler()),
+        asyncio.create_task(_dreaming_scheduler()),
         asyncio.create_task(_presence_watcher()),
         asyncio.create_task(_start_chat_integrations_background()),
         asyncio.create_task(_hermes_scheduler()),
@@ -678,6 +710,7 @@ app.include_router(scorecards_router)
 app.include_router(sovereignty_metrics_router)
 app.include_router(sovereignty_ws_router)
 app.include_router(three_strike_router)
+app.include_router(dreaming_router)
 
 
 @app.websocket("/ws")

src/dashboard/routes/dreaming.py

@@ -0,0 +1,84 @@
+"""Dreaming mode dashboard routes.
+
+GET  /dreaming/api/status   — JSON status of the dreaming engine
+GET  /dreaming/api/recent   — JSON list of recent dream records
+POST /dreaming/api/trigger  — Manually trigger a dream cycle (for testing)
+GET  /dreaming/partial      — HTMX partial: dreaming status panel
+"""
+
+import logging
+
+from fastapi import APIRouter, Request
+from fastapi.responses import HTMLResponse, JSONResponse
+
+from dashboard.templating import templates
+from timmy.dreaming import dreaming_engine
+
+logger = logging.getLogger(__name__)
+
+router = APIRouter(prefix="/dreaming", tags=["dreaming"])
+
+
+@router.get("/api/status", response_class=JSONResponse)
+async def dreaming_status():
+    """Return current dreaming engine status as JSON."""
+    return dreaming_engine.get_status()
+
+
+@router.get("/api/recent", response_class=JSONResponse)
+async def dreaming_recent(limit: int = 10):
+    """Return recent dream records as JSON."""
+    dreams = dreaming_engine.get_recent_dreams(limit=limit)
+    return [
+        {
+            "id": d.id,
+            "session_excerpt": d.session_excerpt[:200],
+            "decision_point": d.decision_point[:200],
+            "simulation": d.simulation,
+            "proposed_rule": d.proposed_rule,
+            "created_at": d.created_at,
+        }
+        for d in dreams
+    ]
+
+
+@router.post("/api/trigger", response_class=JSONResponse)
+async def dreaming_trigger():
+    """Manually trigger a dream cycle (bypasses idle check).
+
+    Useful for testing and manual inspection. Forces idle state temporarily.
+    """
+    from datetime import UTC, datetime, timedelta
+    from config import settings
+
+    # Temporarily back-date last activity to appear idle
+    original_time = dreaming_engine._last_activity_time
+    dreaming_engine._last_activity_time = datetime.now(UTC) - timedelta(
+        minutes=settings.dreaming_idle_threshold_minutes + 1
+    )
+
+    try:
+        dream = await dreaming_engine.dream_once()
+    finally:
+        dreaming_engine._last_activity_time = original_time
+
+    if dream:
+        return {
+            "status": "ok",
+            "dream_id": dream.id,
+            "proposed_rule": dream.proposed_rule,
+            "simulation": dream.simulation[:200],
+        }
+    return {"status": "skipped", "reason": "No dream produced (no sessions or LLM unavailable)"}
+
+
+@router.get("/partial", response_class=HTMLResponse)
+async def dreaming_partial(request: Request):
+    """HTMX partial: dreaming status panel for the dashboard."""
+    status = dreaming_engine.get_status()
+    recent = dreaming_engine.get_recent_dreams(limit=5)
+    return templates.TemplateResponse(
+        request,
+        "partials/dreaming_status.html",
+        {"status": status, "recent_dreams": recent},
+    )

src/dashboard/templates/partials/dreaming_status.html

@@ -0,0 +1,32 @@
+{% if not status.enabled %}
+<div class="dream-disabled text-muted small">Dreaming mode disabled</div>
+{% elif status.dreaming %}
+<div class="dream-active">
+  <span class="dream-pulse"></span>
+  <span class="dream-label">DREAMING</span>
+  <div class="dream-summary">{{ status.current_summary }}</div>
+</div>
+{% elif status.idle %}
+<div class="dream-idle">
+  <span class="dream-dot dream-dot-idle"></span>
+  <span class="dream-label-idle">IDLE</span>
+  <span class="dream-idle-meta">{{ status.idle_minutes }}m — dream cycle pending</span>
+</div>
+{% else %}
+<div class="dream-standby">
+  <span class="dream-dot dream-dot-standby"></span>
+  <span class="dream-label-standby">STANDBY</span>
+  <span class="dream-idle-meta">idle in {{ status.idle_threshold_minutes - status.idle_minutes }}m</span>
+</div>
+{% endif %}
+
+{% if recent_dreams %}
+<div class="dream-history mt-2">
+  {% for d in recent_dreams %}
+  <div class="dream-record">
+    <div class="dream-rule">{{ d.proposed_rule if d.proposed_rule else "No rule extracted" }}</div>
+    <div class="dream-meta">{{ d.created_at[:16] | replace("T", " ") }}</div>
+  </div>
+  {% endfor %}
+</div>
+{% endif %}

src/timmy/dreaming.py

@@ -0,0 +1,435 @@
+"""Dreaming Mode — idle-time session replay and counterfactual simulation.
+
+When the dashboard has been idle for a configurable period, this engine
+selects a past chat session, identifies key agent response points, and
+asks the LLM to simulate alternative approaches.  Insights are stored as
+proposed rules that can feed the auto-crystallizer or memory system.
+
+Usage::
+
+    from timmy.dreaming import dreaming_engine
+
+    # Run one dream cycle (called by the background scheduler)
+    await dreaming_engine.dream_once()
+
+    # Query recent dreams
+    dreams = dreaming_engine.get_recent_dreams(limit=10)
+
+    # Get current status dict for API/dashboard
+    status = dreaming_engine.get_status()
+"""
+
+import json
+import logging
+import re
+import sqlite3
+import uuid
+from collections.abc import Generator
+from contextlib import closing, contextmanager
+from dataclasses import dataclass
+from datetime import UTC, datetime, timedelta
+from pathlib import Path
+from typing import Any
+
+from config import settings
+
+logger = logging.getLogger(__name__)
+
+_DEFAULT_DB = Path("data/dreams.db")
+
+# Strip <think> tags from reasoning model output
+_THINK_TAG_RE = re.compile(r"<think>.*?</think>\s*", re.DOTALL)
+
+# Minimum messages in a session to be worth replaying
+_MIN_SESSION_MESSAGES = 3
+
+# Gap in seconds between messages that signals a new session
+_SESSION_GAP_SECONDS = 1800  # 30 minutes
+
+
+@dataclass
+class DreamRecord:
+    """A single completed dream cycle."""
+
+    id: str
+    session_excerpt: str      # Short excerpt from the replayed session
+    decision_point: str       # The agent message that was re-simulated
+    simulation: str           # The alternative response generated
+    proposed_rule: str        # Rule extracted from the simulation
+    created_at: str
+
+
+@contextmanager
+def _get_conn(db_path: Path = _DEFAULT_DB) -> Generator[sqlite3.Connection, None, None]:
+    db_path.parent.mkdir(parents=True, exist_ok=True)
+    with closing(sqlite3.connect(str(db_path))) as conn:
+        conn.row_factory = sqlite3.Row
+        conn.execute("""
+            CREATE TABLE IF NOT EXISTS dreams (
+                id            TEXT PRIMARY KEY,
+                session_excerpt TEXT NOT NULL,
+                decision_point  TEXT NOT NULL,
+                simulation      TEXT NOT NULL,
+                proposed_rule   TEXT NOT NULL DEFAULT '',
+                created_at      TEXT NOT NULL
+            )
+        """)
+        conn.execute("CREATE INDEX IF NOT EXISTS idx_dreams_time ON dreams(created_at)")
+        conn.commit()
+        yield conn
+
+
+def _row_to_dream(row: sqlite3.Row) -> DreamRecord:
+    return DreamRecord(
+        id=row["id"],
+        session_excerpt=row["session_excerpt"],
+        decision_point=row["decision_point"],
+        simulation=row["simulation"],
+        proposed_rule=row["proposed_rule"],
+        created_at=row["created_at"],
+    )
+
+
+class DreamingEngine:
+    """Idle-time dreaming engine — replays sessions and simulates alternatives."""
+
+    def __init__(self, db_path: Path = _DEFAULT_DB) -> None:
+        self._db_path = db_path
+        self._last_activity_time: datetime = datetime.now(UTC)
+        self._is_dreaming: bool = False
+        self._current_dream_summary: str = ""
+        self._dreaming_agent = None  # Lazy-initialised
+
+    # ── Public API ────────────────────────────────────────────────────────
+
+    def record_activity(self) -> None:
+        """Reset the idle timer — call this on every user/agent interaction."""
+        self._last_activity_time = datetime.now(UTC)
+
+    def is_idle(self) -> bool:
+        """Return True if the system has been idle long enough to start dreaming."""
+        threshold = settings.dreaming_idle_threshold_minutes
+        if threshold <= 0:
+            return False
+        return datetime.now(UTC) - self._last_activity_time > timedelta(minutes=threshold)
+
+    def get_status(self) -> dict[str, Any]:
+        """Return a status dict suitable for API/dashboard consumption."""
+        return {
+            "enabled": settings.dreaming_enabled,
+            "dreaming": self._is_dreaming,
+            "idle": self.is_idle(),
+            "current_summary": self._current_dream_summary,
+            "idle_minutes": int(
+                (datetime.now(UTC) - self._last_activity_time).total_seconds() / 60
+            ),
+            "idle_threshold_minutes": settings.dreaming_idle_threshold_minutes,
+            "dream_count": self.count_dreams(),
+        }
+
+    async def dream_once(self) -> DreamRecord | None:
+        """Execute one dream cycle.
+
+        Returns the stored DreamRecord, or None if the cycle was skipped
+        (not idle, dreaming disabled, no suitable session, or LLM error).
+        """
+        if not settings.dreaming_enabled:
+            return None
+
+        if not self.is_idle():
+            logger.debug(
+                "Dreaming skipped — system active (idle for %d min, threshold %d min)",
+                int((datetime.now(UTC) - self._last_activity_time).total_seconds() / 60),
+                settings.dreaming_idle_threshold_minutes,
+            )
+            return None
+
+        if self._is_dreaming:
+            logger.debug("Dreaming skipped — cycle already in progress")
+            return None
+
+        self._is_dreaming = True
+        self._current_dream_summary = "Selecting a past session…"
+        await self._broadcast_status()
+
+        try:
+            return await self._run_dream_cycle()
+        except Exception as exc:
+            logger.warning("Dream cycle failed: %s", exc)
+            return None
+        finally:
+            self._is_dreaming = False
+            self._current_dream_summary = ""
+            await self._broadcast_status()
+
+    def get_recent_dreams(self, limit: int = 20) -> list[DreamRecord]:
+        """Retrieve the most recent dream records."""
+        with _get_conn(self._db_path) as conn:
+            rows = conn.execute(
+                "SELECT * FROM dreams ORDER BY created_at DESC LIMIT ?",
+                (limit,),
+            ).fetchall()
+        return [_row_to_dream(r) for r in rows]
+
+    def count_dreams(self) -> int:
+        """Return total number of stored dream records."""
+        with _get_conn(self._db_path) as conn:
+            row = conn.execute("SELECT COUNT(*) AS c FROM dreams").fetchone()
+            return row["c"] if row else 0
+
+    # ── Private helpers ───────────────────────────────────────────────────
+
+    async def _run_dream_cycle(self) -> DreamRecord | None:
+        """Core dream logic: select → simulate → store."""
+        # 1. Select a past session from the chat log
+        session = await self._select_session()
+        if not session:
+            logger.debug("No suitable chat session found for dreaming")
+            self._current_dream_summary = "No past sessions to replay"
+            return None
+
+        decision_point, session_excerpt = session
+
+        self._current_dream_summary = f"Simulating alternative for: {decision_point[:60]}…"
+        await self._broadcast_status()
+
+        # 2. Simulate an alternative response
+        simulation = await self._simulate_alternative(decision_point, session_excerpt)
+        if not simulation:
+            logger.debug("Dream simulation produced no output")
+            return None
+
+        # 3. Extract a proposed rule
+        proposed_rule = await self._extract_rule(decision_point, simulation)
+
+        # 4. Store and broadcast
+        dream = self._store_dream(
+            session_excerpt=session_excerpt,
+            decision_point=decision_point,
+            simulation=simulation,
+            proposed_rule=proposed_rule,
+        )
+
+        self._current_dream_summary = f"Dream complete: {proposed_rule[:80]}" if proposed_rule else "Dream complete"
+
+        logger.info(
+            "Dream [%s]: replayed session, proposed rule: %s",
+            dream.id[:8],
+            proposed_rule[:80] if proposed_rule else "(none)",
+        )
+
+        await self._broadcast_status()
+        await self._broadcast_dream(dream)
+        return dream
+
+    async def _select_session(self) -> tuple[str, str] | None:
+        """Select a past chat session and return (decision_point, session_excerpt).
+
+        Uses the SQLite chat store.  Groups messages into sessions by time
+        gap.  Picks a random session with enough messages, then selects one
+        agent response as the decision point.
+        """
+        try:
+            from infrastructure.chat_store import DB_PATH
+
+            if not DB_PATH.exists():
+                return None
+
+            import asyncio
+            rows = await asyncio.to_thread(self._load_chat_rows)
+            if not rows:
+                return None
+
+            sessions = self._group_into_sessions(rows)
+            if not sessions:
+                return None
+
+            # Filter sessions with enough messages
+            valid = [s for s in sessions if len(s) >= _MIN_SESSION_MESSAGES]
+            if not valid:
+                return None
+
+            import random
+            session = random.choice(valid)  # noqa: S311 (not cryptographic)
+
+            # Build a short text excerpt (last N messages)
+            excerpt_msgs = session[-6:]
+            excerpt = "\n".join(
+                f"{m['role'].upper()}: {m['content'][:200]}" for m in excerpt_msgs
+            )
+
+            # Find agent responses as candidate decision points
+            agent_msgs = [m for m in session if m["role"] in ("agent", "assistant")]
+            if not agent_msgs:
+                return None
+
+            decision = random.choice(agent_msgs)  # noqa: S311
+            return decision["content"], excerpt
+
+        except Exception as exc:
+            logger.warning("Session selection failed: %s", exc)
+            return None
+
+    def _load_chat_rows(self) -> list[dict]:
+        """Synchronously load chat messages from SQLite."""
+        from infrastructure.chat_store import DB_PATH
+
+        with closing(sqlite3.connect(str(DB_PATH))) as conn:
+            conn.row_factory = sqlite3.Row
+            rows = conn.execute(
+                "SELECT role, content, timestamp FROM chat_messages "
+                "ORDER BY timestamp ASC"
+            ).fetchall()
+        return [dict(r) for r in rows]
+
+    def _group_into_sessions(self, rows: list[dict]) -> list[list[dict]]:
+        """Group chat rows into sessions based on time gaps."""
+        if not rows:
+            return []
+
+        sessions: list[list[dict]] = []
+        current: list[dict] = [rows[0]]
+
+        for prev, curr in zip(rows, rows[1:]):
+            try:
+                t_prev = datetime.fromisoformat(prev["timestamp"].replace("Z", "+00:00"))
+                t_curr = datetime.fromisoformat(curr["timestamp"].replace("Z", "+00:00"))
+                gap = (t_curr - t_prev).total_seconds()
+            except Exception:
+                gap = 0
+
+            if gap > _SESSION_GAP_SECONDS:
+                sessions.append(current)
+                current = [curr]
+            else:
+                current.append(curr)
+
+        sessions.append(current)
+        return sessions
+
+    async def _simulate_alternative(
+        self, decision_point: str, session_excerpt: str
+    ) -> str:
+        """Ask the LLM to simulate an alternative response."""
+        prompt = (
+            "You are Timmy, a sovereign AI agent in a dreaming state.\n"
+            "You are replaying a past conversation and exploring what you could "
+            "have done differently at a key decision point.\n\n"
+            "PAST SESSION EXCERPT:\n"
+            f"{session_excerpt}\n\n"
+            "KEY DECISION POINT (your past response):\n"
+            f"{decision_point[:500]}\n\n"
+            "TASK: In 2-3 sentences, describe ONE concrete alternative approach "
+            "you could have taken at this decision point that would have been "
+            "more helpful, more accurate, or more efficient.\n"
+            "Be specific — reference the actual content of the conversation.\n"
+            "Do NOT include meta-commentary about dreaming or this exercise.\n\n"
+            "Alternative approach:"
+        )
+
+        raw = await self._call_agent(prompt)
+        return _THINK_TAG_RE.sub("", raw).strip() if raw else ""
+
+    async def _extract_rule(self, decision_point: str, simulation: str) -> str:
+        """Extract a proposed behaviour rule from the simulation."""
+        prompt = (
+            "Given this pair of agent responses:\n\n"
+            f"ORIGINAL: {decision_point[:300]}\n\n"
+            f"IMPROVED ALTERNATIVE: {simulation[:400]}\n\n"
+            "Extract ONE concise rule (max 20 words) that captures what to do "
+            "differently next time.  Format: 'When X, do Y instead of Z.'\n"
+            "Rule:"
+        )
+
+        raw = await self._call_agent(prompt)
+        rule = _THINK_TAG_RE.sub("", raw).strip() if raw else ""
+        # Keep only the first sentence/line
+        rule = rule.split("\n")[0].strip().rstrip(".")
+        return rule[:200]  # Safety cap
+
+    async def _call_agent(self, prompt: str) -> str:
+        """Call the Timmy agent for a dreaming prompt (skip MCP, 60 s timeout)."""
+        import asyncio
+
+        if self._dreaming_agent is None:
+            from timmy.agent import create_timmy
+
+            self._dreaming_agent = create_timmy(skip_mcp=True)
+
+        try:
+            async with asyncio.timeout(settings.dreaming_timeout_seconds):
+                run = await self._dreaming_agent.arun(prompt, stream=False)
+        except TimeoutError:
+            logger.warning("Dreaming LLM call timed out after %ds", settings.dreaming_timeout_seconds)
+            return ""
+        except Exception as exc:
+            logger.warning("Dreaming LLM call failed: %s", exc)
+            return ""
+
+        raw = run.content if hasattr(run, "content") else str(run)
+        return raw or ""
+
+    def _store_dream(
+        self,
+        *,
+        session_excerpt: str,
+        decision_point: str,
+        simulation: str,
+        proposed_rule: str,
+    ) -> DreamRecord:
+        dream = DreamRecord(
+            id=str(uuid.uuid4()),
+            session_excerpt=session_excerpt,
+            decision_point=decision_point,
+            simulation=simulation,
+            proposed_rule=proposed_rule,
+            created_at=datetime.now(UTC).isoformat(),
+        )
+        with _get_conn(self._db_path) as conn:
+            conn.execute(
+                """
+                INSERT INTO dreams
+                    (id, session_excerpt, decision_point, simulation, proposed_rule, created_at)
+                VALUES (?, ?, ?, ?, ?, ?)
+                """,
+                (
+                    dream.id,
+                    dream.session_excerpt,
+                    dream.decision_point,
+                    dream.simulation,
+                    dream.proposed_rule,
+                    dream.created_at,
+                ),
+            )
+            conn.commit()
+        return dream
+
+    async def _broadcast_status(self) -> None:
+        """Push current dreaming status via WebSocket."""
+        try:
+            from infrastructure.ws_manager.handler import ws_manager
+
+            await ws_manager.broadcast("dreaming_state", self.get_status())
+        except Exception as exc:
+            logger.debug("Dreaming status broadcast failed: %s", exc)
+
+    async def _broadcast_dream(self, dream: DreamRecord) -> None:
+        """Push a completed dream record via WebSocket."""
+        try:
+            from infrastructure.ws_manager.handler import ws_manager
+
+            await ws_manager.broadcast(
+                "dreaming_complete",
+                {
+                    "id": dream.id,
+                    "proposed_rule": dream.proposed_rule,
+                    "simulation": dream.simulation[:200],
+                    "created_at": dream.created_at,
+                },
+            )
+        except Exception as exc:
+            logger.debug("Dreaming complete broadcast failed: %s", exc)
+
+
+# Module-level singleton
+dreaming_engine = DreamingEngine()

static/css/mission-control.css

@@ -2549,6 +2549,7 @@
 .tower-adv-action { font-size: 0.75rem; color: var(--green); margin-top: 4px; font-style: italic; }
 
 
+
 /* ── Voice settings ───────────────────────────────────────── */
 .voice-settings-page { max-width: 600px; margin: 0 auto; }
 
@@ -2714,3 +2715,45 @@
   padding: 0.3rem 0.6rem;
   margin-bottom: 0.5rem;
 }
+
+
+/* ═══════════════════════════════════════════════════════════════
+   Dreaming Mode
+   ═══════════════════════════════════════════════════════════════ */
+
+.dream-active {
+  display: flex; align-items: center; gap: 8px;
+  padding: 6px 0;
+}
+.dream-label { font-size: 0.75rem; font-weight: 700; color: var(--purple); letter-spacing: 0.12em; }
+.dream-summary { font-size: 0.75rem; color: var(--text-dim); font-style: italic; flex: 1; }
+
+.dream-pulse {
+  display: inline-block; width: 8px; height: 8px; border-radius: 50%;
+  background: var(--purple);
+  animation: dream-pulse 1.8s ease-in-out infinite;
+}
+@keyframes dream-pulse {
+  0%, 100% { opacity: 1; transform: scale(1); }
+  50%       { opacity: 0.4; transform: scale(0.7); }
+}
+
+.dream-dot {
+  display: inline-block; width: 7px; height: 7px; border-radius: 50%;
+}
+.dream-dot-idle     { background: var(--amber); }
+.dream-dot-standby  { background: var(--text-dim); }
+
+.dream-idle, .dream-standby {
+  display: flex; align-items: center; gap: 6px; padding: 4px 0;
+}
+.dream-label-idle    { font-size: 0.7rem; font-weight: 700; color: var(--amber); letter-spacing: 0.1em; }
+.dream-label-standby { font-size: 0.7rem; font-weight: 700; color: var(--text-dim); letter-spacing: 0.1em; }
+.dream-idle-meta     { font-size: 0.7rem; color: var(--text-dim); }
+
+.dream-history { border-top: 1px solid var(--border); padding-top: 6px; }
+.dream-record  { padding: 4px 0; border-bottom: 1px solid var(--border); }
+.dream-record:last-child { border-bottom: none; }
+.dream-rule    { font-size: 0.75rem; color: var(--text); font-style: italic; }
+.dream-meta    { font-size: 0.65rem; color: var(--text-dim); margin-top: 2px; }
+

tests/unit/test_dreaming.py

@@ -0,0 +1,217 @@
+"""Unit tests for the Dreaming mode engine."""
+
+import sqlite3
+from contextlib import closing
+from datetime import UTC, datetime, timedelta
+from pathlib import Path
+from unittest.mock import AsyncMock, MagicMock, patch
+
+import pytest
+
+from timmy.dreaming import DreamingEngine, DreamRecord, _SESSION_GAP_SECONDS
+
+
+# ── Fixtures ──────────────────────────────────────────────────────────────────
+
+
+@pytest.fixture()
+def tmp_dreams_db(tmp_path):
+    """Return a temporary path for the dreams database."""
+    return tmp_path / "dreams.db"
+
+
+@pytest.fixture()
+def engine(tmp_dreams_db):
+    """DreamingEngine backed by a temp database."""
+    return DreamingEngine(db_path=tmp_dreams_db)
+
+
+@pytest.fixture()
+def chat_db(tmp_path):
+    """Create a minimal chat database with some messages."""
+    db_path = tmp_path / "chat.db"
+    with closing(sqlite3.connect(str(db_path))) as conn:
+        conn.execute("""
+            CREATE TABLE chat_messages (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                role TEXT NOT NULL,
+                content TEXT NOT NULL,
+                timestamp TEXT NOT NULL,
+                source TEXT NOT NULL DEFAULT 'browser'
+            )
+        """)
+        now = datetime.now(UTC)
+        messages = [
+            ("user",  "Hello, can you help me?",          (now - timedelta(hours=2)).isoformat()),
+            ("agent", "Of course! What do you need?",     (now - timedelta(hours=2, seconds=-5)).isoformat()),
+            ("user",  "How does Python handle errors?",   (now - timedelta(hours=2, seconds=-60)).isoformat()),
+            ("agent", "Python uses try/except blocks.",   (now - timedelta(hours=2, seconds=-120)).isoformat()),
+            ("user",  "Thanks!",                          (now - timedelta(hours=2, seconds=-180)).isoformat()),
+        ]
+        conn.executemany(
+            "INSERT INTO chat_messages (role, content, timestamp) VALUES (?, ?, ?)",
+            messages,
+        )
+        conn.commit()
+    return db_path
+
+
+# ── Idle detection ─────────────────────────────────────────────────────────────
+
+
+class TestIdleDetection:
+    def test_not_idle_immediately(self, engine):
+        assert engine.is_idle() is False
+
+    def test_idle_after_threshold(self, engine):
+        engine._last_activity_time = datetime.now(UTC) - timedelta(minutes=20)
+        with patch("timmy.dreaming.settings") as mock_settings:
+            mock_settings.dreaming_idle_threshold_minutes = 10
+            assert engine.is_idle() is True
+
+    def test_not_idle_when_threshold_zero(self, engine):
+        engine._last_activity_time = datetime.now(UTC) - timedelta(hours=99)
+        with patch("timmy.dreaming.settings") as mock_settings:
+            mock_settings.dreaming_idle_threshold_minutes = 0
+            assert engine.is_idle() is False
+
+    def test_record_activity_resets_timer(self, engine):
+        engine._last_activity_time = datetime.now(UTC) - timedelta(minutes=30)
+        engine.record_activity()
+        with patch("timmy.dreaming.settings") as mock_settings:
+            mock_settings.dreaming_idle_threshold_minutes = 10
+            assert engine.is_idle() is False
+
+
+# ── Status dict ───────────────────────────────────────────────────────────────
+
+
+class TestGetStatus:
+    def test_status_shape(self, engine):
+        with patch("timmy.dreaming.settings") as mock_settings:
+            mock_settings.dreaming_enabled = True
+            mock_settings.dreaming_idle_threshold_minutes = 10
+            status = engine.get_status()
+        assert "enabled" in status
+        assert "dreaming" in status
+        assert "idle" in status
+        assert "dream_count" in status
+        assert "idle_minutes" in status
+
+    def test_dream_count_starts_at_zero(self, engine):
+        with patch("timmy.dreaming.settings") as mock_settings:
+            mock_settings.dreaming_enabled = True
+            mock_settings.dreaming_idle_threshold_minutes = 10
+            assert engine.get_status()["dream_count"] == 0
+
+
+# ── Session grouping ──────────────────────────────────────────────────────────
+
+
+class TestGroupIntoSessions:
+    def test_single_session(self, engine):
+        now = datetime.now(UTC)
+        rows = [
+            {"role": "user",  "content": "hi",   "timestamp": now.isoformat()},
+            {"role": "agent", "content": "hello", "timestamp": (now + timedelta(seconds=10)).isoformat()},
+        ]
+        sessions = engine._group_into_sessions(rows)
+        assert len(sessions) == 1
+        assert len(sessions[0]) == 2
+
+    def test_splits_on_large_gap(self, engine):
+        now = datetime.now(UTC)
+        gap = _SESSION_GAP_SECONDS + 100
+        rows = [
+            {"role": "user",  "content": "hi",    "timestamp": now.isoformat()},
+            {"role": "agent", "content": "hello",  "timestamp": (now + timedelta(seconds=gap)).isoformat()},
+        ]
+        sessions = engine._group_into_sessions(rows)
+        assert len(sessions) == 2
+
+    def test_empty_input(self, engine):
+        assert engine._group_into_sessions([]) == []
+
+
+# ── Dream storage ─────────────────────────────────────────────────────────────
+
+
+class TestDreamStorage:
+    def test_store_and_retrieve(self, engine):
+        dream = engine._store_dream(
+            session_excerpt="User asked about Python.",
+            decision_point="Python uses try/except blocks.",
+            simulation="I could have given a code example.",
+            proposed_rule="When explaining errors, include a code snippet.",
+        )
+        assert dream.id
+        assert dream.proposed_rule == "When explaining errors, include a code snippet."
+
+        retrieved = engine.get_recent_dreams(limit=1)
+        assert len(retrieved) == 1
+        assert retrieved[0].id == dream.id
+
+    def test_count_increments(self, engine):
+        assert engine.count_dreams() == 0
+        engine._store_dream(
+            session_excerpt="test", decision_point="test", simulation="test", proposed_rule="test"
+        )
+        assert engine.count_dreams() == 1
+
+
+# ── dream_once integration ─────────────────────────────────────────────────────
+
+
+class TestDreamOnce:
+    @pytest.mark.asyncio
+    async def test_skips_when_disabled(self, engine):
+        with patch("timmy.dreaming.settings") as mock_settings:
+            mock_settings.dreaming_enabled = False
+            result = await engine.dream_once()
+        assert result is None
+
+    @pytest.mark.asyncio
+    async def test_skips_when_not_idle(self, engine):
+        engine._last_activity_time = datetime.now(UTC)
+        with patch("timmy.dreaming.settings") as mock_settings:
+            mock_settings.dreaming_enabled = True
+            mock_settings.dreaming_idle_threshold_minutes = 60
+            result = await engine.dream_once()
+        assert result is None
+
+    @pytest.mark.asyncio
+    async def test_skips_when_already_dreaming(self, engine):
+        engine._is_dreaming = True
+        with patch("timmy.dreaming.settings") as mock_settings:
+            mock_settings.dreaming_enabled = True
+            mock_settings.dreaming_idle_threshold_minutes = 0
+            result = await engine.dream_once()
+        # Reset for cleanliness
+        engine._is_dreaming = False
+        assert result is None
+
+    @pytest.mark.asyncio
+    async def test_dream_produces_record_when_idle(self, engine, chat_db):
+        """Full cycle: idle + chat data + mocked LLM → produces DreamRecord."""
+        engine._last_activity_time = datetime.now(UTC) - timedelta(hours=1)
+
+        with (
+            patch("timmy.dreaming.settings") as mock_settings,
+            patch("timmy.dreaming.DreamingEngine._call_agent", new_callable=AsyncMock) as mock_agent,
+            patch("infrastructure.chat_store.DB_PATH", chat_db),
+        ):
+            mock_settings.dreaming_enabled = True
+            mock_settings.dreaming_idle_threshold_minutes = 10
+            mock_settings.dreaming_timeout_seconds = 30
+            mock_agent.side_effect = [
+                "I could have provided a concrete try/except example.",  # simulation
+                "When explaining errors, always include a runnable code snippet.",  # rule
+            ]
+
+            result = await engine.dream_once()
+
+        assert result is not None
+        assert isinstance(result, DreamRecord)
+        assert result.simulation
+        assert result.proposed_rule
+        assert engine.count_dreams() == 1