Calculate the best time to go to bed based on REM sleep cycles
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Suggested Bedtimes
⚠️ Keep in mind: Regularly sleeping more than 9 hours may be associated with health issues. Consult a healthcare professional if you consistently need more sleep.
Why Sleep in Full REM Cycles?
Sleep occurs in cycles of approximately 90 minutes, progressing through different stages including REM (Rapid Eye Movement) sleep. Waking up at the end of a complete cycle, rather than in the middle of one, helps you feel more refreshed and alert. This sleep calculator suggests bedtimes that align with complete 90-minute sleep cycles, accounting for the time it takes you to fall asleep.