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    Calculate wake-up time

    Online sleep calculator helps calculate the best wake-up time.

    A person's sleep consists of two phases:
    rapid sleep (~20 minutes)
    slow sleep (~2 hours)

    These phases constantly alternate. During slow sleep, the human body recovers, during rapid sleep it tests internal systems and rests.
    During rapid sleep, a person may toss or even mutter something, as the brain is in an active state. Waking up at this time is the easiest and most pleasant. This online calculator helps calculate the time of rapid sleep phases.


    Current time 22 : 07



    Selected time

    If you fall asleep at 21 : 48, wake up at:

    00 : 08 sleep time 02 : 20

    02 : 28 sleep time 04 : 40

    04 : 48 sleep time 07 : 00

    07 : 08 sleep time 09 : 20

    09 : 28 sleep time 11 : 40

    11 : 48 sleep time 14 : 00

    14 : 08 sleep time 16 : 20