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#11
This sometimes happens to my HP after Repair Installs and version Upgrades. Usually, it's one of two things - disable Fast Startup ( cmd prompt admin/ powercfg -h off / Enter ). May not work but unless you use Hibernation, can't hurt and saves space.
More likely, in my case, at least- If Sleep still doesn't appear, roll back the display driver which Windows Update may have updated to an incompatible newer one- go to
Device Manager/ Display adapters/ r-click driver/ Update driver/ Browse my computer for driver hardware/ Let me pick from a list of available drivers on my computer / select oldest version listed (or use MS Basic) / Next and finish install/ reboot
Sleep should appear now. Test for a few days to see if all is OK with older driver, as far as Display goes, block Windows update from updating that driver or repeat process, if it occurs again. - Prevent Windows Update from Updating Specific Device Driver
Good Luck