How to Program Your PC to Hibernate
You can save power and not-quite-exactly turn your PC by making it hibernate. When your computer hibernates, it saves all the memory — everything the system is doing — then turns the computer off. Hibernating means your computer is really and truly off, not just sleeping.
To hibernate your computer, you must program one of the power buttons:
Choose Control Panel→System and Maintenance.
If you’re in classic view, double-click Power Options.
Select Change What the Power Buttons Do.
This item appears below the Power Options heading or as a link on the left side of the Power Options window.
Select Hibernate from the drop-down list to the right of the button that you want to program.
You can program the console's power button or the console’s moon button (if it has one).
After you program one of those buttons, pressing it hibernates the computer.