Sleep Calculator
Calculate the best times to go to sleep or wake up based on 90-minute sleep cycles. Waking at the end of a complete cycle helps you feel more rested. Enter your wake time or bedtime to see recommended schedules.
Inputs
Results
Best Time
9:45 PM
6 cycles (9h)
Quality
Excellent
Recommendation
Aim to fall asleep by 9:45 PM for 6 full sleep cycles (9 hours of sleep).
Sleep Options
| Time | Cycles | Hours | Quality |
|---|---|---|---|
| 9:45 PM | 6 | 9 | Excellent |
| 11:15 PM | 5 | 7.5 | Excellent |
| 12:45 AM | 4 | 6 | Good |
| 2:15 AM | 3 | 4.5 | Fair |