Sleep Calculator
Best bedtime and wake-up times based on 90-min sleep cycles
Ideal bedtimes to wake at 6:30 AM
Includes 15 min to fall asleep
1:45 AM
4h 30m (3 cycles)
12:15 AM
6h (4 cycles)
10:45 PM
7h 30m (5 cycles)
9:15 PM
9h (6 cycles)
7:45 PM
10h 30m (7 cycles)
6:15 PM
12h (8 cycles)
Sleep cycles last ~90 minutes. Waking mid-cycle causes grogginess. Most adults need 5-6 cycles (7.5-9 hours). The 15-minute buffer accounts for average time to fall asleep.
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Calculated with CalcHub