To turn off the display and switch to Sleep mode, you can: 
		   
		   
			 - Briefly press the POWER button. 
			 
 
 
			 - Double-tap the lock screen. 
			 
 
 
		  
 
		  HTC Desire 626 also automatically goes into Sleep mode when it’s left idle for a while. You can change the time before 
			 
HTC Desire 626 sleeps by setting the screen timeout. For details, see 
			 
Setting when to turn off the screen.