Sleep calculator
Waking mid-cycle leaves you groggy. Find the right time.
Everything happens in your browser: your files are never uploaded to a server.
For guidance: everyone has their own rhythm.
How to use it
- Pick "I want to wake at" or "Going to sleep now".
- Enter the time.
- Pick one of the suggested times (5 or 6 cycles is ideal).
FAQ
Why 90 minutes?
It is the average length of a sleep cycle. We allow 15 minutes to fall asleep.
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