Summary
If you are missing the option to enable Hibernate and Sleep in Windows 10 Power Options menu, the following article will show you how.
Details
Click Start, type: Power Options
Click it
Under Control Panel Home, click Choose what the power buttons do
Click the link Change settings that are currently unavailable
Then scroll down to the bottom of the window and ensure Sleep is checked and click Save Changes
You should now see them listed when you click Start > Power