I have been using this app for about two months. It is great to be made aware of your bedtime, along with showing you how much sleep you will get if you go to bed “NOW”. You can setup easily how many hours of sleep you desire, the app does the rest. You have options on the way it waked you up also. I have nature sounds near a swamp. The first time it played I seriously thought a flock of birds were overhead. It was sort of timely as Canadian Geese have been flying overhead for the past month.
Here is the article, its all part of the new iOS.