go to sleep
idiom
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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  Merriam-Webster unabridged




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