The power-saving modes in Windows are turned on and off in your computer’s BIOS (basic input/output system). If you don’t have administrative access on the computer, you may have to refer to the administrator to change the option. Refer to the documentation for your video card. Your video card may not support Sleep mode. If you don’t see the Sleep option or the Hibernate option, it may be for one of the following reasons: In Windows 7, the Sleep and Hibernate options are accessed using the arrow button next to the Shut down button on the Start menu. In Windows 10, the Hibernate and Sleep options are accessed using the Power button on the Start menu. How to Put Your Computer In Sleep or Hibernation Mode When power resumes, Windows can restore your work from the hard disk, if the memory is not accessible. Hybrid Sleep mode is useful for desktop computers in case of a power outage. When enabled, it automatically puts your computer into Hybrid Sleep mode when you put it into Sleep mode. The Hybrid Sleep mode is enabled by default in Windows on desktop computers and disabled on laptops. It puts any open documents and applications in memory and on your hard disk, and then puts your computer into a low-power state, allowing you to quickly wake the computer and resume your work. Hybrid Sleep mode is a combination of the Sleep and Hibernate modes meant for desktop computers. Use this mode if you won’t be using your laptop for an extended period of time, and you don’t want to close your documents. It just takes a bit longer to resume than sleep mode does (though with an SSD, the difference isn’t as noticeable as it is with traditional hard drives). Once the computer is powered back on, it will resume everything where you left off. This allows your computer to turn off entirely, which means once your computer is in Hibernate mode, it uses zero power. Hibernate mode is very similar to sleep, but instead of saving your open documents and running applications to your RAM, it saves them to your hard disk. RELATED: How to Make Windows Hibernate More Often (Instead of Sleep) The computer doesn’t use much power in Sleep mode, but it does use some. 
Sleep mode is useful if you want to stop working for a short period of time.
Sleep mode is basically the same thing as “Standby” mode. You can quickly resume normal, full-power operation within a few seconds.
The computer technically stays on, but only uses a bit of power. All actions on the computer are stopped, any open documents and applications are put in memory while the computer goes into a low-power state. Sleep mode is a power saving state that is similar to pausing a DVD movie. RELATED: PSA: Don't Shut Down Your Computer, Just Use Sleep (or Hibernation)
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