Circadian Health90-Minute Ultradian Cycles

Sleep Calculator

Determine the perfect time to fall asleep or wake up between 90-minute sleep cycles, preventing sleep inertia and waking up feeling fully recharged.

Select your target wake-up time to calculate optimal bedtimes

Wake-Up Target Time:

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Recommended Bedtimes

Target: Wake at 7:00 AM

6 Sleep Cycles (9h 0m)

9:46 PM

Optimal Rest

5 Sleep Cycles (7h 30m)

11:16 PM

Optimal Rest

4 Sleep Cycles (6h 0m)

12:46 AM

Good Rest

3 Sleep Cycles (4h 30m)

2:16 AM

Minimum Rest

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