Choose the time your alarm is set for. Each page gives the bedtimes that finish a complete sleep cycle — so you wake at the end of one, not from the middle of deep sleep — with 15 minutes to fall asleep already built in. For any other time, or a different fall-asleep estimate, use the sleep calculator.
Bedtimes by wake-up time
MathWake tracks your sleep with your phone’s motion and sound, shows your cycles each morning, then wakes you with an alarm that rings on silent mode and will not stop until you finish a wake-up mission. The sleep tracker is free.
Download MathWake for iPhone