to sleep until later in the morning than you usually do
to sleep in
to start to sleep, especially when you did not intend to and during the day
to doze off, drop off, nod off
to go to bed
to turn in
to gradually start to sleep
to drift off
to sleep while something is happening and not be woken by it, to sleep continuously for a long time
to sleep through (something/till some time)
to start to ring loudly
to go off
to go to/fall asleep very quickly because you are very tired
to crash out
