“I only got four hours of sleep last night.”

English Lesson: I only got four hours of sleep last night.

A coworker mentions that you look sleepy. You explain why by saying this.

I only got four hours of sleep last night.

Audio by native English speakers

get (a number of) hours of sleep

When you're talking about how much you slept at night, you usually use the expression "get ___ hours of sleep":

I usually get 7 or 8 hours of sleep every night.

You say "I slept for ___ hours" when you sleep for an extra long time, or when you fall asleep at a strange time of day:

I laid down after lunch and slept for 4 hours.