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Sleep Calculator
Calculate optimal sleep and wake times
Go to sleep at one of these times:
9:45 PM
6 cycles
9h sleep
11:15 PM
5 cycles
7.5h sleep
12:45 AM
4 cycles
6h sleep
2:15 AM
3 cycles
4.5h sleep
Sleep Cycle Info
Sleep Cycles
Each sleep cycle is ~90 minutes. Waking up between cycles helps you feel refreshed.
Recommended Sleep
Adults need 7-9 hours (4-6 cycles). 5-6 cycles is optimal for most people.
Green = Optimal
5-6 cycles (7.5-9 hours) is ideal for adults.
Yellow = Adequate
4 cycles (6 hours) is minimum for functioning well.