Add Sleep or Hibernate to Power Options in Windows 8

By default Power Options contains Switch User

• Sign Out
• Shut down
• Restart

but we can add Sleep &  Hibernate options to Power Options!
Yes.Here is how:
1.Click on Start and type power options and look in Settings!
On the left side you can get Power Options and click on it to open.

OR
Select the second option on above picture

2.On the Left side you can see "Choose what the power buttons do".

Click on it.
3.Now you will be in System Settings! so in this you can see "Change settings that are currently unavailable"

Click on it.
4.Now on the same area bottom you can see as following picture

Just Check all the Check Box and click on Save changes.
5.Now open the Power Options by pressing Alt+F4, you can all options.