In order to ensure your computer is always available to process print jobs, you may need to change your power settings.
Focus your cursor in the Search Box at the bottom right, and enter "power options". Choose the "Power Options" item that is shown.
On the left-pane, click "Change when the computer sleeps" link to open Edit plan settings window.
Here, in the drop-down menus next to "Put the computer to sleep", select "Never" for On battery and Plugged in. Click Save changes button.
Note that, instead of selecting Never, selecting any other number will enable the sleep mode in Windows 10.