The hibernation mode on a computer can be compared to the sleep mode.
The Hibernation File is one fat file that, quite often these days, may never see any real use. Some files can’t be deleted because they are locked while your system is running. It’s best to reboot after cleaning out all the files you are able to delete. Be sure to close out everything to make it easier. This will happen if you have a program open that is using those files. When you do this, Windows might give you an error message that the files cannot be deleted. You can visit this folder at C:\Windows\Temp and delete everything inside by pressing Ctrl + A to select everything and then Delete. So, we recommend you try to delete the TEMP folder. Even though Disk Cleanup is great, sometimes for whatever reason, it doesn’t always get stuff out of the TEMP folder.