nod off

(idiom) to sleep, to nap

Example Sentences:

I think I’m going to nod off for a few minutes. I’m really tired.

A: What time did you nod off last night?
B: Around 11.

Similar idioms:

1. nod off
2. hit the hay
3. turn in
4. hit the sack
5. sleep like a log
6. sleep soundly