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Verb: go to sleep
  1. Prepare for sleep
    "He goes to sleep at the crack of dawn";
    - go to bed, turn in [informal], bed, kip down [informal], hit the hay [informal], hit the sack [informal], sack out [N. Amer, informal], retire

Derived forms: gone to sleep, goes to sleep, went to sleep, going to sleep

Encyclopedia: Go to sleep