Anyone cares to explain how the 'alarm' works? The website doesn't say much.
Here's the difference.
Say you set your alarm for 7 am. The app starts looking at the sleep phase you are in from 6:30 am (this is configurable), if you enter a light sleep phase (N1) at 6:45, the alarm goes off and wake up without feeling groggy. If you don't enter a light sleep phase, the alarm goes off regardless at 7 am so you don't miss meetings and such.