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Wiktionary
hit the hay

vb. (context idiomatic English) To go to bed.

WordNet
hit the hay

v. go to bed in order to sleep; "I usually turn in at midnight"; "He turns out at the crack of dawn" [syn: go to bed, turn in, bed, crawl in, kip down, hit the sack, sack out, go to sleep, retire] [ant: get up, get up]

Usage examples of "hit the hay".

After taking a walk about the ship I figure that there ain't no Desperate Desmonds aboard, and having earned my hundred the night before I just curl up in that little cabin and hit the hay.

I was about ready to hit the hay when Detective-Sergeant Green of homicide called me up.