RestCycleCalculator

Plan approximate bedtimes, wake times and naps using your chosen time to fall asleep and estimated cycle length. Results include dates, so plans crossing midnight remain clear. Save useful plans on your device and share them. A 90-minute cycle is a planning assumption. Real sleep cycles vary, and the app cannot predict whether you will wake refreshed. Prioritise enough sleep and a consistent schedule. This app does not measure sleep, diagnose a condition, set alarms or replace professional advice. Read companion guides about sleep habits, naps, shift work and jet lag. Online guides require internet access; the calculator works offline.