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I'm gonna hit the sack

I'm going to sleep

EN
Example

I'm exhausted-I'm gonna hit the sack as soon as I finish this shower.

When to use it

After a long shift, you're yawning at the door while saying goodnight to your roommate.

What it means

Literally "I'm going to strike the bag/sack."
In practice it just means you're going to bed or going to sleep, usually in a casual, end-of-the-day way. It can imply you're tired and ready to crash, not that you're going to sleep at some specific scheduled time. "Gonna" is very informal and spoken, so this whole phrase sounds relaxed and friendly. People have used "hit the sack" for a long time; it likely comes from the idea of sleeping on a sack or sack-stuffed mattress in the past.

Don't confuse it with

"I'm gonna hit the sack" does not mean i'm going to head out, i'm going to grab some food, i'm going to the gym. It specifically means "I'm going to sleep".

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