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Sleep is a power-saving state that allows a computer to quickly resume full-power operation (typically within several seconds) when you want to start working again. Putting your computer into the sleep state is like pausing a DVD player: The computer immediately stops what it’s doing and is ready to start again when you want to resume working.

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.

Hybrid sleep is designed primarily for desktop computers. Hybrid sleep is a combination of sleep and hibernate—it puts any open documents and programs in memory and on your hard disk, and then puts your computer into a low-power state so that you can quickly resume your work. That way, if a power failure occurs, Windows can restore your work from your hard disk. When hybrid sleep is turned on, putting your computer into sleep automatically puts your computer into hybrid sleep. Hybrid sleep is typically turned on by default on desktop computers.

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If sleep or hibernate aren't available, it might be for one or more of the following reasons:

Your video card might not support sleep. Update the driver for your video card, or check the information that came with your computer about your video card and supported drivers. For more information, see Update drivers.

Some settings are managed by your system administrator. For more information, see Why can't I change some settings?.

Sleep and other power-saving states are turned off in your computer's basic input/output system (BIOS). To turn on sleep, restart your computer, and then enter the BIOS setup. As your computer starts, instructions typically appear on the screen that indicate which key or keyboard shortcut you must press to enter the BIOS setup process. Because not all computer manufacturers use the same BIOS, different keys are assigned for this purpose. To learn more, check the information that came with your computer or go to the manufacturer’s website.

If the Hibernate option is missing, you might have Hybrid sleep turned on.

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