Definition of go to sleep
1 : to begin sleeping She lay down on the couch and went (right) to sleep. Tell the kids it's time to go to sleep. After the party, I just wanted to go to sleep.
2 of a part of the body (such as a foot or leg) : to be without feeling for a brief time usually because it has been kept in an awkward position for too long When I started to get up I realized my foot had gone to sleep.
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