Why is it so hard to scream and move in a nightmare?

During a nightmare, while you are asleep the scream problem could be a way of your brain inducing more fear by cutting off your vocal ability. read more

I find it's because I physically can't move or shout in my regular body. Some people sleepwalk, mumble, or move a little in their dreams; whatever. When I occasionally build up the awareness in my dreams to feel my actual body, I find I'm lying on my side, regardless of what is actually taking place. read more

Sleep paralysis is the terrifying feeling of being held down after just waking up or going to sleep. You can't move or scream, and sometimes this paralysis is accompanied with the certainty that someone --or something -- is in the room. read more