Where is the sleep button for Windows 8? There is no sleep related option in the default power options in

Win8.

use Alt + F4 to see at close Windows Aero interface option, there is still no sleep.

Win + R and a command input gpedit.msc Win7 consistent.

then enter the Group Policy interface, select "Computer Configuration", "Administrative Templates", "Windows Components."

then look again "Windows Explorer", in this branch are strategically a mark in English, means that the show dormant in the Power Options: "Show hibermate in the power options menu", according to the usual Action, change it to Enabled. Group Policy settings

forced refresh before, win + X to select "Command Prompt (Admin)."

enter "gpupdate /force".

turn on the power management interface again, then found returning to the hibernation option appeared.

try a little sleep option, but it looks like the interface into the restart, no sleep. What is the reason for this? Is there a device that prevents attempts to hibernate? Perhaps for this reason, Win8 hides the hibernate option by default.
Since this is the case, check to see which device is blocking sleep or affecting hibernation.
Continue to use win+X to select "Command Prompt (Administrator)" and enter "powercfg /devicequery wake_armed".

view to support the wake from sleep case of computer equipment of a mouse. Modify it to not let it wake up the computer, the computer can finally sleep under Win8.