Online sleep calculator

English

This online sleep calculator will help you calculate the best time to wake up. You can also try 4 types of polyphase sleep

Normal sleep

Polyphasic sleep

Sleep in:

Fast sleep:

Wake up to:

Slow sleep:

Sleep can be divided into two stages:

REM (rapid eye movement) (~20 minutes)

Non-REM (~2 hours)

These two stages interchange all the time. During non-REM sleep a human body repairs itself, and during REM sleep it tests its systems and rests. You can customize them for yourself in this calculator. In REM sleep a man can tumble and even murmur something, because the brain is active. It is most pleasant and easy to wake up at this stage. Online Sleep Calculator will help you determine your REM sleep stage, as well as try out polyphasic sleep.