Take Control: Power Properties Page 1 2 3 4 5
 
Start- -> Control Panel -> System and Maintenance -> Power

Sleep and Display

Turn off the display

Your screen display consumes a lot of energy. It also puts out a significant amount of heat. You can turn off the display automatically whenever you have been away from your computer (afk!) for more than 20 minutes.

 

Put the Computer to sleep

Making the computer go to sleep saves power. It is not the same as turning it off because it leaves all of your toys and applications open the way you left them. It is similar to the instant-on button in your TV.

Wake up, turtles, older than me!