Good App

Very reliable, and works well with my iphone 7 plus. The sleep tracker seems to coincide with my awakenings at night, and even in the morning before my alarm goes off.

P.S. if youre looking for how to disable the alarm and just track your sleep, tap "Sleep" on the alarm screen and then the little clock icon will start to jiggle. Tap the jiggling clock and youve just disabled the alarm. Now you can track your sleep without being awoken the next morning if you want to sleep in uninterrupted.

Bat Flies at Night about Good Morning - Alarm Clock, v1.5