In Windows XP enabling Hibernate option was a very easy task. One could navigate to Control Panel, Power Options and then Hibernate tab to enable or disable Hibernation feature. But in Windows 7, we have to follow a different approach to do the same job.
If you are not aware of Hibernate feature, Hibernation is a power-saving state designed primarily for laptops. While sleep puts your work and settings in memory and draws a small amount of power, hibernation puts your open documents and programs on your hard disk and then turns off your computer. Of all the power-saving states in Windows, hibernation uses the least amount of power. On a laptop, use hibernation when you know that you won’t use your laptop for an extended period and won’t have an opportunity to charge the battery during that time.