Turn Apple TV 4K on or off
There are several ways to turn Apple TV 4K on and off.
Turn on Apple TV 4K
On your remote, do any of the following:
Press
.Press
or 
.Press
(silver remote only).
Turn off Apple TV 4K
On your remote, do any of the following:
Press and hold
to open Control Centre, then select Power Off in Control Centre.Press and hold
(silver remote only).
You can also turn off Apple TV 4K by opening Settings 
and selecting Power Off.
Set the delay before Apple TV 4K automatically turns off
Apple TV 4K automatically turns off after a preset period of inactivity. You can set how long Apple TV 4K waits before turning off.
Go to Settings
on Apple TV 4K.Go to General > Sleep After and choose an option.
You can also set a one-off sleep timer.
Important: Delaying or preventing sleep may increase power consumption.
If your TV or audio/visual receiver supports HDMI-CEC, Apple TV 4K automatically turns on when you turn on your TV or receiver or select its HDMI input, and automatically turns off when you turn off your TV or receiver. You can also program the remote you use for Apple TV 4K to turn your TV or receiver on or off.