Sleep Schedule Estimate
Calculate a bedtime from a wake time and explicit cycle-length assumptions.
How to use this tool
- Enter values or select a file in the labelled controls.
- Select the action button and review the result.
- Copy the result or use its download control when available.
A planning estimate, not a sleep-stage measurement. NHLBI describes cycles of about 80–100 minutes; actual cycles vary. A fixed interval cannot guarantee an ideal waking stage. Bedtime may fall on the previous day.
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Reference: NHLBI sleep phases and stages