How to Adjust Sleep Mode in Windows 7
If you leave your Widows 7 computer idle for awhile, by default it will go into sleep mode. In this mode, the computer stops all processes until you tell it to wake up. When it does wake up, it starts up again quickly in the same place it was. This saves power. For example, in a laptop, sleep mode helps preserve battery power when you are not working. You can change the amount of idle time necessary before Windows 7 puts your computer to sleep.
Click the "Start" button.
Click "Control Panel," "System and Security" and "Power Options." You will see a list of different power plans on your computer. How many you have depends upon the make and model of your computer. The plan currently in use has a blue dot in front of it.
Click "Change Plan Settings" next to the power plan currently in use.
Click on the drop-down menu next to "Put the Computer to sleep:" to set the amount of idle time before entering sleep mode. Laptop users will have two drop-down menus, one for when the computer is plugged in and the other for when it is running on battery power.
Click "Save Changes." If you want, modify the other power plans.