Sleep Cycle Calculator — Wake Up Refreshed Instead of Groggy

You: Goodnight, going to sleep now

Agent: Goodnight! Going to bed at 11:45 PM.
Adding 15 minutes to fall asleep → sleep onset ~12:00 AM.

⏰ WAKE-UP RECOMMENDATIONS:

🥇 Most recommended: 7:30 AM (5 cycles = 7.5 hours)
   Best balance of rest and cycles

Alternative options:
🥈 6:00 AM (4 cycles = 6 hours)
   Less sleep but you'll feel alert — good if early meeting
🥉 9:00 AM (6 cycles = 9 hours)
   Maximum recovery — only if schedule allows
⚠️ 4:30 AM (3 cycles = 4.5 hours)
   Emergency only — not sustainable

Set your alarm for 7:30. Sleep well 🌙

You: I keep waking up at 3 AM. Any advice?

Agent:
## 3 AM Waking — Common Causes & Fixes

Most likely causes (in order):
1. TEMPERATURE — Room too warm. Core body temp drops at
   3 AM naturally. If your room is above 20°C, your body
   can't cool enough for deep sleep maintenance.
   Fix: Set room to 18°C. Sounds cold, you'll sleep
   better with a warm blanket in a cool room.

2. BLOOD SUGAR — If you ate a high-sugar/high-carb
   dinner, blood sugar crashes around 3 AM, triggering
   cortisol (your alert hormone).
   Fix: Add protein or fat to your evening meal. A
   small snack before bed (handful of nuts, cheese) can
   stabilize overnight glucose.

3. ALCOHOL — Even moderate drinking disrupts sleep
   architecture in the second half of the night. You
   fall asleep fine, then wake at 3 AM as your body
   processes alcohol.
   Fix: Stop alcohol 3 hours before bed. Or track
   which nights you drink vs which nights you wake.

4. LIGHT — Any light exposure (phone checking, bathroom
   light, streetlight through curtains) during a brief
   natural awakening can prevent re-entry to sleep.
   Fix: Blackout curtains. Phone on silent in another
   room. Nightlight in bathroom (red/amber, never white).

5. STRESS/ANXIETY — Cortisol surge. The classic "mind
   racing at 3 AM" pattern.
   Fix: Keep a notepad by the bed. Write the thought
   down. Your brain will let go if it knows the thought
   is captured somewhere.

Try temperature first — it's the most common cause
and the easiest to fix. Track for one week.

Agent:
## Sleep Pattern Analysis (4 weeks)

Average sleep: 6.8 hours (target: 7.5-8)
Average quality rating: 6.2/10
Consistent bedtime: No (range: 10:30 PM - 1:15 AM ⚠️)

KEY FINDING: Bedtime consistency matters more than
duration for your data.

Your BEST sleep nights (quality 8-9/10):
- Bedtime between 11:00-11:30 PM
- No screens after 10:30 PM
- No alcohol
- Room temp: 18-19°C (you mentioned AC on these nights)

Your WORST sleep nights (quality 3-5/10):
- Bedtime after midnight (5 of 7 worst nights)
- Phone in bed (you mentioned "scrolling" on these)
- Alcohol within 3 hours of bed (4 of 7 worst)

ONE CHANGE: Set a "bedtime alarm" at 11:00 PM.
Not to sleep immediately — to start your wind-down.
Phone goes to another room. This single change predicts
+1.5 quality points based on your own data.

skills:
  - sleep-tracker
  - sleep-wakeup-advisor
  - health-guardian     # For Apple Watch sleep data integration