go to sleep go to sleep /ɡoʊ tuː sliːp/

verb

1. () Prepare for sleep  ( bed , crawl in , hit the hay [Informal] , go to sleep , hit the sack [Informal] , kip down [Informal] , retire , sack out [Informal, N. American] , turn in [Informal] , go to bed )
   prepare for sleep
    I usually turn in at midnight
   I usually turn in at midnight
    He goes to bed at the crack of dawn
   He goes to bed at the crack of dawn