There is no option of hibernation on windows 8 power option. Here I give you tutorials to make your computer into hibernation.

1. Go to the Control Panel

2. Select "small icons". Click on "power option".

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3. Click on "Choose what the Power button does" on the left.

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4. Scroll down to the bottom, and you can see "Show Hibernate" box.
If the settings are grayed, click on the "Change settings that are currently unavailabe" at the top, then change it.

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Thanks to eow for Tutorials!

You can allso make a shortcut on your desktop that goes like this:

- Shutdown /h

the /h command tells your computer to hibernate.