Hibernation is a mixed power option between completely shutdown and sleep mode mostly designed for laptop/tablet. Upon hibernation, the computer saves the contents of its RAM to a hard disk in a file named hiberfil.sys which could be a few GB of size sitting on the system drive. Then upon resumption, the computer is exactly as it was before entering hibernation.
Hibernation can be invoked from the Start menu in the previous version of Windows but was removed by default in Windows 10. Here is how you can add the option back if hibernating your computer is what you do at the end of every day.
Click Start button and type “Power Option” in Cortana, click the Power Options (Control Panel) to open it.
Next, click the “Choose what the power buttons do” link on the left side links.
Then, click the link “Change settings that are currently unavailable“.
Scroll down to the bottom and check the option “Hibernate” in Shutdown settings section.
Save the change and it’s all set. Now let’s take look what the Power Menu looks like in the Start menu.