In earlier versions of Windows, standby saves your work to memory and puts your computer into a power-saving state. Hibernate also puts your computer into a power-saving state but saves your work to your hard disk so that you can safely turn off your computer.
In this version of Windows, sleep saves your work to memory, and then puts your computer into a power-saving state. Hybrid sleep, a combination of sleep and hibernate, saves your work to both memory and your hard disk, and then puts your computer into a power-saving state. Hybrid sleep is turned off by default on mobile PCs. For more information about hibernate and hybrid sleep, see Turn off a computer: frequently asked questions.
Hybrid sleep and hibernate might become unavailable after you run Disk Cleanup. For information about how to re-enable hybrid sleep and hibernate, go to the hybrid sleep and hibernation article on the Microsoft website.
Sleep offers the following advantages over shutting down your computer:
All of your work, including information about the programs that you were using, such as window location and size, is automatically saved to memory.
When your computer wakes, Windows restores your previous work session within seconds. You don't need to restart your computer and then reopen the files that you were working on.
A device or scheduled task might wake your computer from sleep unexpectedly. For more information, see Troubleshoot power problems.