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...
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Updated: June 21, 2011
Version 1.4 [0.052224 MB]