I know this thread is old, but I want to chime in that I experience this exact same thing pretty regularly and recently discovered something that I haven’t seen anyone else mention. As many people are saying the experience of feeling awake but having dream-like hallucinations where you can’t move or scream or escape is called sleep paralysis. But I just recently learned that the additional part of feeling like there is a very loud buzzing in your head that you can’t stop is called “Exploding Head Syndrome”. This condition is much rarer than sleep paralysis but often accompanies it when it does show up. The problem is there is very little information on the subject and it is rather mysterious. If you look it up you will find various descriptions but the over all recurring trend is that people “hear” loud noises while falling asleep that are so disruptive they actually keep you from entering deep sleep. Mine feels like I have a buzzing phone in my head that won’t stop vibrating. It’s so loud I want to scream but I can’t. It can even be a physical sensation of an electric voltage in my brain, sizzling and crackling and sending shocks down my spine. Other times I hallucinate that someone is mowing the lawn in the middle of the night or that the phone is ringing off the hook. Sometimes the hallucinations figure into it where I think that a shadowy figure has implanted something loud in my head and it is quite frightening. It manifests in any number of different ways but they all keep me from having good sleep and I’ve rarely come across anyone who knows what I’m talking about until now. I’ve been told it is most likely harmless by a few Drs but I am also in an on-going search to find answers for recent seizures and debilitating brain-zaps while awake, so naturally I imagine they are related. They may not be.