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Sleep Cycle Calculator

Sleep runs in roughly 90-minute cycles, and waking at the end of a cycle feels much better than waking mid-cycle. Enter the time you need to wake up and this calculator gives four bedtimes that land on whole cycles.

How to use

1. Enter the time you need to wake up (24-hour format).
2. Click Calculate to see four bedtime options.
3. Pick the bedtime that gives you 5 or 6 full cycles.