The Apple TV set-top box is ready for you to use it anytime you wish. It automatically goes to sleep after a preset period of time, but you can change those settings.
To put your Apple TV to sleep:
If your TV or audio/visual receiver supports HDMI-CEC, your Apple TV automatically goes to sleep when you turn off your TV or receiver and wakes up when you select its HDMI input on your TV or receiver. You can also turn your TV or receiver on or off with the Siri Remote. See Control your TV and volume with the Siri Remote.
Do one of the following:
- Siri Remote (2nd generation or later): Press and hold the Power button.
- Press and hold the TV button to open Control Center, then select Sleep.
- Open Settings on Apple TV, then select Sleep Now.
To wake up your Apple TV, take one of these actions:
- Siri Remote (2nd generation or later): Press the Powe , Back, or TV button.
- Siri Remote (1st generation): Press the MENU or TV button.
To set the delay before the Apple TV automatically goes to sleep:
- Open Settings on Apple TV.
- Go to General > Sleep After and choose an option.
(This how-to is based on my experiences and info on Apple’s support pages.)