Tell me when I have to go to bed if I want to wake up at dawn

From Silas on 2016/06/10 13:43:40 +0000

…and ring 10 mins after dawn arrives! So I can wake up with the sun and don’t have to worry about oversleeping.

Copied from original feature request: http://urbandroid.uservoice.com/forums/264867-sleep-as-android/suggestions/14775228-tell-me-when-i-have-to-go-to-bed-if-i-want-to-wake