I have read, heard, and personaly experienced the phenomenon known as "Night Terrors". The experience of waking-up in the middle of the night, paralyzed, not able to move, or speak. And usualy having visions of another being, or beings in the room with you. Some describe shadow people, others describe an "Old Hagg". appearing during these attacks. The feeling of being pressed down on, with great pressure, it can be overwhelming, very terrifying.
I woke-up one night, after hearing a strange breathing sound, although I was very groggy as I woke, it seemed as if the sound was comming from someone, or something right over me, as if in my face. When I came to, I couldn't move, my entire body was paralyzed. I tried to call out for help, but I couldn't speak, or move my mouth, no matter how I tried. I could actualy feel the presense of something hovering over me. I felt hands, or clawlike things holding me down. Finaly, after struggling, I could move my feet, then I began to kick my legs in sheer terror. although my legs were moving now, the rest of my body, I had no control over. I was so relieved when the ordeal was finaly over. Ever since then I think about that experience, and sometimes wounder if it had been a demon, or "Suckubus" attack? All I know is, I don't ever want to go through that again...Ever!