sleep it off

sleep off

To reduce or rid oneself of some unpleasant condition by getting extra sleep. A noun or pronoun can be used between "sleep" and "off." He drank a bit too much, but he'll be fine—he just needs to sleep it off. I think I'll head home early and try to sleep off this head cold.
See also: off, sleep
Farlex Dictionary of Idioms.

sleep it off

tv. to sleep while the effects of drugs or alcohol wear off. I’m polluted, I guesh. Have to get home and sleep it off.
See also: off, sleep
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • sleep off
  • drift off to sleep
  • sleep around the clock
  • lose sleep about (someone or something)
  • lose sleep over (someone or something)
  • got to go home and get my beauty sleep
  • (I've) got to go home and get my beauty sleep
  • beauty
  • winks
  • kip down