When Go To Sleep

The best time to wake up is after 4, 5, or 6 sleep cycles
in REM phase when brain is more active.
The calculated time is not accurate, only suggestive.

How to use:

Enter the time when you want to wake up 
and the app will calculate a good time when to go to sleep
or
enter the time when you go to sleep
and the app will calculate a good time to wake up.

Tap on the background to stop and play the background animation.