Ever wondered why you wake up some mornings feeling like train ran you over, while on others you feel fresh as a daisy?  Yes, it has to do with the amount of hours you've been snoozin', but there's another part of the equation that is just as important: your sleep cycle.  This bedtime calculator will figure out what time you need to hit the hay each night.  Get ready to wake up refreshed and energized!

Sleepyti.me is a bedtime calculator that counts backwards in sleep cycles to make sure that you wake up in between cycles.  Sleep cycles last about 90 minutes.  Waking up in the middle of a cycle will have you feeling tired, but if you wake up in between you'll be up and alert.

There are two options.  You can either fill out when you need to wake up, or you can click the Zzz button right before you plan on going to sleep.  Either way, Sleepyti.me will calculate the best times for you to wake up!