Sleep Calculator

Calculate optimal sleep and wake times based on 90-minute sleep cycles. Wake up feeling refreshed by timing your sleep properly.

6,800 AI Tokens Used

Feb 2, 2026 Created

healthproductivity

Go to sleep at:

9:45 PM

6 cycles9h sleep

Recommended

11:15 PM

5 cycles7.5h sleep

Recommended

12:45 AM

4 cycles6h sleep

Good

2:15 AM

3 cycles4.5h sleep

Minimum

How It Works

Sleep happens in cycles of approximately 90 minutes. Waking up between cycles (rather than during one) helps you feel more refreshed.

This calculator factors in 15 minutes to fall asleep and calculates optimal wake times based on complete sleep cycles.

Recommended Sleep by Age

Adults (18-64)7-9 hours

Older Adults (65+)7-8 hours

Teenagers (14-17)8-10 hours

Children (6-13)9-11 hours

Sleep Tips

Keep a consistent sleep schedule, even on weekends
Avoid screens for 30+ minutes before bed
Keep your bedroom cool (65-68°F / 18-20°C)
Avoid caffeine 6+ hours before bedtime

How This Tool Was Built

This tool was created entirely by AI. Here's the exact prompt used to generate it:

Prompt Used

Create a Sleep Calculator tool with these features:

1. Two modes:
   - I want to wake up at... (calculate bedtimes)
   - I want to go to sleep at... (calculate wake times)
2. Time input with current time button
3. Show multiple options (3-6 sleep cycles)
4. Color-code results: optimal (green), good (yellow), minimum (red)
5. Show hours of sleep for each option
6. Factor in 15 minutes to fall asleep
7. Educational info about 90-minute sleep cycles
8. Recommended sleep by age reference
9. Sleep tips section

Make it calming with purple as the accent color.

Claude AI Model

6,800 Tokens Used

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