Sleep Cycle Calculator
Calculate the best times to sleep or wake up based on 90-minute sleep cycles.
🛏️ Go to bed at:
💤 Sleep Tips
- • No caffeine 6h before bed
- • Keep room cool (65-68°F)
- • No screens 1h before sleep
- • Consistent sleep schedule
Features
- Calculate bedtime or wake time
- Based on 90-minute sleep cycles
- Adjustable fall asleep time
- Sleep quality indicators
How to Use
- 1Choose bedtime or wake time mode
- 2Set your target time
- 3Adjust fall asleep time
- 4View recommended times
Frequently Asked Questions
What is a sleep cycle?
A 90-minute pattern of light, deep, and REM sleep.
How many cycles do I need?
Most adults need 5-6 cycles (7.5-9 hours).