Hybrid sleep is most likely enabled.
- From the screen above, return to Power Option screen by clicking Power Options in the address bar.
- And then click Change power plan link next to the active power plan.
Alternatively you can click Choose when to turn off display or Change when the computer sleeps on the left pane.
- Click Change advanced power options.
- Expand Sleep and then Allow hybrid sleep:
It has to be set to Off if you want to see Hibernate option separately.
When hybrid sleep is enabled, Sleep command combines sleeps and hibernate: the system saves RAM to
hiberfil.sys and then puts the computer to sleep. This option is useful for desktop computers which do not have battery:
- If power supply is not interrupted, the system will wake up almost instantly (from sleep);
- If power supply is interrupted, the system will read RAM from
hiberfil.sys and resume from hibernation.
For laptops, it makes sense to disable hybrid sleep: it has battery, and thus the system will enter low power mode faster. If the battery level becomes low, Windows will automatically hibernate the laptop.
The screen shot and the names of links are from Windows 7. This hasn't changed much in Windows 8, I have to no access to Windows 8 system at the moment.