re: Any snooze button junkies?

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Does it use movement to determine your REM cycles or something?

eta: so let's say I have to be up at 7:40a... What time do I set the alarm on that app?

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I have the sleep cycle app. It uses your breathing patterns to determing your sleep stage. If you want to be up at 7:40AM you set the 30 minute window to wake you up no later than 7:40. It will wake you up between 7:10 and 7:40 if you are in a light sleep pattern and @ 7:40 even if you are in a deep sleep pattern. It also gives you stats and after 5 nights makes graphs so you can better time you sleep. I get my best results if I get around 6.5 hours of sleep and it takes me ~15mins to fall asleep. So I try to get in bed 7 hours before I have to get up and usually wake up 10-15 minutes before the endtime which is nice because it has a snooze feature that lets you drift but never fall back asleep.