However, if you wish, you can add it, and here’s how:
Now, click on “Change settings that are currently unavailable” link at the top.
Select the “Hibernate” option. Click on the “Save changes” button at the bottom.
Not only it adds Hibernate to Power menu in the Start menu, but it also adds Hibernate to Power menu shown in the Sign-in screen and Windows Security screen. Also, it adds the Hibernate to “Shut Down Windows” pop-up and Shut down or sign out option in the Power user menu.
Note: If you want to remove Hibernate from the Power menu, then follow the above steps and instead of checking, uncheck.