Health
Sleep Calculator
Find the best time to go to sleep or wake up based on sleep cycles. Wake up feeling refreshed every time.
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Frequently Asked Questions
What is a sleep cycle?
A sleep cycle lasts approximately 90 minutes and includes light sleep, deep sleep, and REM sleep. Most adults need 5–6 complete cycles per night.
Why should I wake up between sleep cycles?
Waking up at the end of a sleep cycle rather than in the middle of one means you wake during light sleep, making it much easier to feel alert.