“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.

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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.