Sleep Cycle Calculator
Find optimal sleep and wake times.
9:45 PM
6 cycles
9.0 hours
Recommended
11:15 PM
5 cycles
7.5 hours
Recommended
12:45 AM
4 cycles
6.0 hours
2:15 AM
3 cycles
4.5 hours
Based on 90-minute sleep cycles with ~15 minutes to fall asleep. Aim for 5-6 complete cycles.