Sleep Cycles: Each sleep cycle lasts about 90 minutes. Waking between cycles (after 6, 7.5, or 9 hours) helps you feel more refreshed.
Sleep Schedule Calculator
How the Sleep Schedule Calculator Works
Enter your desired wake-up time and the calculator works backward using the sleep-cycle intervals built into the tool.
Sleep-Cycle Options
This calculator uses 5, 6, 7.5 and 9 hour intervals, representing approximately 4, 5, 6 or 7 sleep cycles of 90 minutes each.
These are planning suggestions rather than medical recommendations. Individual sleep needs and sleep timing can vary.
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