😴 Sleep Cycle Calculator

Find the perfect bedtime or wake time based on 90-minute sleep cycles — wake up refreshed!

Wake-up Time

Why Sleep Cycles Matter

A full sleep cycle lasts about 90 minutes and includes light sleep, deep sleep, and REM. Waking mid-cycle causes grogginess. Aim for 5–6 complete cycles (7.5–9 hours) for optimal recovery and cognitive function.

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