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Sleep Calculator

Find optimal bed or wake times aligned to 90-minute sleep cycles.

Best bedtimes (includes 15min to fall asleep)

9:45 PMBest
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

Based on 90-minute sleep cycles. Individual sleep needs vary.

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