english
                    
                    
                    
                        1
                           general:: 
                           Stay awake until late at night. For example, Never call Ethel before noon; she keeps late hours and sleeps all morning.
                           
                           
                           
                           
                        
    
                       
                    
                        
                        
                        
                    
 
                    
                        American Heritage Idioms
                    
                    
                    
                        2
                           general:: 
                           Phrase(s): keep late hours  to stay up or stay out until very late at night.  •  I’m always tired because I keep late hours.  •  If I didn’t keep late hours, I wouldn’t sleep so late in the morning.
                           
                           
                           
                           
                        
    
                       
                    
                        
                        
                        
                    
 
                    
                        McGrawhill's American Idioms And Phrasal Verbs