There was a great app for Pebble smart watches. It's called Morpheuz: https://github.com/JamesFowler42/morpheuz20
It's kind of smart alarm, that was waking you up in right sleep phase. I'm missing this app very much. Still has Pebble Steel with dead battery... I wish I could fix Them just for this app...
Server run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!