Flake out
Definition 1 of 3

Unexpectedly dozing off
Used when someone falls asleep without planning to because of tiredness.

After the marathon, he flaked out on the grass.
Not Literal Sleep
Sometimes used in a humorous way to describe extreme tiredness without actually sleeping.

I'm going to flake out if this meeting doesn't end soon.
Temporary State
Implies a short period of rest, not going to bed for the night.

He flaked out for a few minutes during the movie.
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