This is an app for the people out there that want to get the maximum amount of rest in their period of sleep.
Sleepy Time will calculate the best time for you to fall a sleep when you want to wake up at a given time.
It uses sleep cycles of 90 minutes to calculate the best time to wake up. Waking up between these cycles lets you wake up fresh and alert.
This small handy app is completely free !
Find Sleepy Time for free in Marketplace here.