Sleep Paralysis

Last night as I slept, a tall heavy man, dressed in black, with a knife in his hand pulled open the windows and entered our bedroom. He stood silhouetted against the street light. I needed to scream - because I was frightened and I wanted to frighten him off. But my screams were caught in my throat. I tried and tried to make noise and eventually I woke myself up. And realised it was a dream.
It is said (and I quote)'Sleep Paralysis is possibly a hereditary disorder in which one experiences very frightening seconds or minutes of total body paralysis with little respiration and eye movements. The victim in this state feels awake, but cannot move or speak. In addition to the immobility, common symptoms include feeling choked or suffocated, hearing strange noises like footsteps and voices, seeing beings or dark shadows, and feeling an existance of someone in the room. Although these symptoms often direct the victims to believe in ghosts, mistransmission of neural signals in the brain causes Sleep Paralysis. When a person sleeps, his brain sends signals to inhibit any muscle contraction. If he comes into consciousness before the brain sends signals to activate muscle contraction, he cannot move his body, and consequently, become "paralyzed".
It is said drinking wine before bed doesn't help. It's worse when you're tired and stressed.
It is said sleep paralysis can't kill you.
That's good to know.