buncha/time & productivity/sleepcycle

Sleep Cycle Calculator

Sleep happens in 90-minute cycles. Waking at the end of a cycle leaves you feeling rested. Adults typically need 5–6 cycles per night.

Wake time

Time to fall asleep15 min

You should go to bed at

9:45 PM

9h sleep · 6 cycles

Recommended

11:15 PM

7h 30m sleep · 5 cycles

Recommended

12:45 AM

6h sleep · 4 cycles

2:15 AM

4h 30m sleep · 3 cycles

Adults: 5–6 cycles ideal. Teens: 5–6 cycles. Less than 4 cycles regularly may impact health.

Pairs well with

Calculate the best time to wake up or go to bed based on 90-minute sleep cycles.

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