Health & fitness · NUMORA
Sleep Cycle Calculator
Wake times on 90-minute cycles.
Open interactive calculatorHow to use
Includes 15 minutes to fall asleep.
Formula
wake = bedtime + 15m + 90m × n
FAQ
Is this Sleep Cycle calculator accurate?
The formula and assumptions are shown on the page, and the engine is covered by audit tests. Results are for reference — not financial or medical advice.
Do I need an account?
No. Calculations run in your browser. Recents can stay on this device.
What inputs do I need?
Includes 15 minutes to fall asleep.
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