ποΈ Date & Time~135K searches/moFree Β· No signup
Sleep Calculator
Find the best time to go to bed based on 90-minute sleep cycles, so you wake up refreshed instead of groggy.
How to use this tool
- 1Paste or type your input above.
- 2The result updates instantly.
- 3Copy the output with one click.
Frequently asked questions
Why 90-minute cycles?+
Sleep moves through light, deep and REM stages in ~90-minute cycles. Waking at the end of a cycle (rather than mid-deep-sleep) feels dramatically easier.
Is my data private?+
Yes. The tool runs entirely in your browser β nothing you paste or type is uploaded to a server.
Learn more
- Sleep Calculator: how it works
- sleep calculator tips
- Sleep Calculator FAQs