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Sleep Cycle Calculator

Calculate optimal bedtimes based on 90-minute sleep cycles.

Calculation Mode
Suggested Bedtimes
Includes 15 minutes to fall asleep

09:45 PM

6 cycles (9 hours)

11:15 PM

5 cycles (7.5 hours)

12:45 AM

4 cycles (6 hours)

02:15 AM

3 cycles (4.5 hours)

Sleep Cycle & Bedtime Calculator | Toolzium - Toolzium