The average adult needs at least four 90-minute sleep cycles for a good night's sleep.
Bedtime Calculator as three modes:
Wake up at:
Determine what time you should go to bed if you need to wake up at a specific time.
Go to bed now:
If you go to bed now, what time should you wake up?
Go to bed at:
What time you should wake up if you go to bed at a certain time.
Bedtime Calculator Premium is out now and has no ads and will receive new features first.
Graph your sleep patterns
Soothing sounds to lull you to sleep
You can get it on the market here:
Inspired by http://sleepyti.me
Tags: Sleepytime, sleepyti.me, sleepy time, bedtime, calculator, sleep cycle, circadian rhythm