If you don't use Hibernate, you are able to open an elevated command prompt and type in "powercfg.exe /hibernate off". This should clear up 2-3+GB depending on the amount of RAM you have.

Also...

You may have deleted your main EFI folder, go into the BIOS/UEFI on your computer and turn off Secure Boot and if required turn Legacy Support on, then test to see if you can boot.

Then you could...

You've checked the Power Options in the Control Panel?
Take a look at: Display - Change Turn off after Time in Windows 10 - Windows 10 Forums

Are your Graphics Drivers up to date?