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Sleep Calculator
Wake up refreshed by sleeping through complete 90-minute cycles
I want to wake up at…
I'm going to sleep at…
Wake-up time
Use current time
Fall-asleep time:
14 min
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Sleep cycles last ~90 minutes.
Waking at the end of a cycle means you finish in light sleep — easier to rise and feel alert. Try to aim for 5 or 6 cycles (7.5 or 9 hours).