There are several reasons why this option is not listed on your Vista installation:

(Quick Links)

1. You have accidentally deleted this option when you performed a disk cleanup.
2. You have inadvertently disabled Hibernation.
3. Hybrid Sleep feature is enabled.
4. Your computer doesn't support Hibernation.

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Listed below are the method that you can use to restore the Hibernation feature to your computer:

<>You have accidentally deleted this option when you performed a disk cleanup:

1. Go to Start
2. In the Search box, type in: cmd
3. Right click the Command Prompt entry.
4. Select Run as administrator from the resulting menu.
5. Type the following command in to the command prompt and then press Enter on your keyboard:
   
   powercfg -h on

This will restore your deleted hibernation files and allow your computer to hibernate correctly again.

<>You have inadvertently disabled Hibernation:

1. Go to Start
2. In the Search box, type in: cmd
3. Right click the Command Prompt entry.
4. Select Run as administrator from the resulting menu.
5. Type the following command in to the command prompt and then press Enter on your keyboard:
   
   powercfg /hibernate on

<>Hybrid Sleep feature is enabled:

Follow the instruction listed in "You have inadvertently disabled Hibernation" above.

<>Your computer doesn't support Hibernation:

1. Go to Start
2. In the Search box, type in: cmd
3. Right click the Command Prompt entry.
4. Select Run as administrator from the resulting menu.
5. Type the following command in to the command prompt and then press Enter on your keyboard:
   
   powercfg /a

This command will inform you of what 'sleep' options are available for your systems hardware configuration.
 

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For more information, refer to the following Microsoft knowledgebase article:

http://support.microsoft.com/kb/929658

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