Sleep Cycle Calculator

Find your optimal bedtime or wake time based on sleep cycles.

I want to wake up at

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How it works

A full sleep cycle lasts ~90 minutes. Waking between cycles helps you feel refreshed. This calculator factors in ~15 minutes to fall asleep and recommends times aligned with complete cycles.

Calculate Sleep Cycles: Wake Up at the Right Time →

Calculate sleep cycles for restful sleep. Understand 90-minute cycles and find your optimal bedtime or wake-up time.