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Your computer can enter into the Sleep mode after a certain time of inactivity. By default, this option is enabled after a brand new Windows installation.
In this guide you will learn how to disable/enable the Sleep mode.
Windows 7
1 Go to Control Panel
Click Start, then go to Control Panel

2 Go to Power Options
Search for Power Options, then click on it.

3 Change plan settings
For the plant that is currently selected or checked, choose Change plan settings

4 Change settings
At Put the computer to sleep, choose Never and your computer will not enter in the Sleep mode. Also, you can choose another time interval. Then click Save changes.

In addition, in the same way, you can disable the turning off of the display.
Windows 8
Press Windows + Q keys to be able to use the Search function.

2 Search for Power Options
Search for Power options, then click on it.

3 Change settings
For the selected plan, click on Change plan settings

4 Turn off Sleep
At Put the computer to sleep, select Never.
Then click Save changes.
Then click Save changes.

Also, you can choose a different time interval if you don’t want to completely disable the Sleep mode.