And, technically, it's not called a sleep timer. It's buried in the Clock app under -- you guessed it -- Timer. It makes perfect sense to put it there. After all, it's just a timer. But rather ...

This is because, providing you go to sleep at a decent time the night before ... Many sunrise alarm clocks have sunset features, built-in FM radio and sleep meditations too.

By gradually emitting light over a period of time, sunrise alarm clocks mimic ... alarm clocks with radio and additional soundscapes allow you to further customize your sleep and wake-up routines.