π΄
Rhad ac am ddim 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-upsNid oes angen mewngofnodiAm ddim am byth
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.
Optimize for your platform
Sut Mae'n Gweithio
1
Ewch i mewn
Rhowch eich testun neu ddata.
2
Proses
Wedi'i brosesu ar unwaith yn eich porwr. Dim gweinydd, dim aros.
3
Lawrlwythwch
Arbedwch eich canlyniad. Nid oes dim yn cael ei storio.
Pam defnyddio ein un ni?
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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