π΄
Free Sleep Cycle Calculator
Find the best time to go to bed or wake up based on 90-minute sleep cycles, so you wake between cycles feeling refreshed instead of groggy.
Runs in your browserNo sign-up, no pop-upsNo login requiredFree forever
Go to bed at
9:45 PM
9 hrs
6 cycles Β· ideal
Go to bed at
11:15 PM
7.5 hrs
5 cycles Β· ideal
Go to bed at
12:45 AM
6 hrs
4 cycles
Go to bed at
2:15 AM
4.5 hrs
3 cycles
π‘ Sleep happens in ~90-minute cycles. Waking at the end of a cycle (rather than mid-cycle) helps you feel refreshed instead of groggy. Most adults do best with 5β6 cycles (7.5β9 hours), plus ~15 minutes to drift off.
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How It Works
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Process
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Save your result. Nothing is stored.
Why use ours?
βCompletely free β no hidden costs, ever
βNo account, email, or login required
βRuns entirely in your browser β no uploads
βWorks on any device β phone, tablet, desktop
βOpen and ad-supported, with no tracking
βLoads fast, with no installation needed
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