I always disable Fast Startup, but even if one doesn't doing a Restart is supposed to dump the existing hibernation file used for Fast Startup and cause Windows 10 to reload from disc from scratch when restarting.
Also, once you've turned Fast Startup off, just doing a Shutdown from the regular power menu should cause the machine to shut down and not write out the OS hibernation file any longer as part of shutting down.
If turning off Fast Startup doesn't solve your issue (and you could turn it back on again if that's your preference even if it caused the problem, since you'll recognize that and know what to do if it recurs) you had ought to turn on the ability to Hibernate (as in full hibernate) via Power Options, Choose what the Power Button does, then try hibernating just to see if that behaves any differently with regard to being able to come back from it.
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134
Memory is a crazy woman that hoards rags and throws away food.
~ Austin O'Malley