So this has been happening to me for a least 10 years of my life, I'll wake up from deep sleep and I'll think that there is someone in the room, an intruder. I am always awake when this happens too because I react to it, I'll either scream, call out for help or I try to wake my partner. Is there a name for this or any way I can prevent it from happening. It is utterly terrifying and I want it to stop.
