Windows 8.1 - Configure the Automatic Maintenance settings
Windows 8 is by default configured to run the Automatic Maintenance feature at 3:00 AM and at this time of the day, most of us are sleeping.
To configure the daily automatic maintenance settings of Windows 8, follow the below procedure:
Go to the Control Panel > System and Security > Action Center
Expand the Maintenance section and click on "Change maintenance settings".
Use the drop menu next to "Run maintenance tasks daily at " to make your selection: