Set up automatic suspend
You can configure your computer to automatically suspend when idle. Different intervals can be specified for running on battery or plugged in.
- Go to the Desktop and start typing Power. 
- Click Power to open the panel. 
- In the Suspend & Power Button section, click Automatic suspend. 
- 
Choose On Battery Power or Plugged In, set the switch to on, and select a Delay. Both options can be configured. On a desktop computer, there is one option labeled When Idle.