Health
Sleep Calculator
Pick a wake time. See bedtimes that land on 90-minute cycles.
- Runs in this tab
- Free
- No signup
Wake time
Assumes 15 minutes to fall asleep and 90-minute cycles. People vary.
Try going to bed at
21:45
6 cycles
21:45
5 cycles
23:15
4 cycles
00:45
How to use Sleep
Fill in the fields above (or pick a file). The answer shows on this same page. More calculators are linked below.
Questions
No. It's free. No account either.
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