As a child, my twin sister and I remember a man, a man we called the "Triangle Man" come into our room at night and terrify us. This did not happen every night, but it happened more than once, and we both consciously remember that.
He would come in through the wall, and only when we were in bed... never when we were awake playing or during the day, only at night when we were to be going to sleep. When he would come in the room, through the wall, the floor seemed to shift in a downward motion, like we would be sliding down toward him, although the bed never moved, and we couldn't either. We wouldn't be able to move at all, like we were paralyzed.
Our beds were side by side with a small dresser between us, and although we couldn't turn our heads to look at each other, we could see each other out of the corner of our eyes and we would stare at each other in fear. I remember also feeling like I knew he was coming and there was nothing I or my sister could do about it. He would slowly walk up to the end of our beds and look at us. There were times I remember him coming up right beside me and looking at me, or going to my sister and I would watch him watch her.
Neither of us remember abduction or anything like that, but we both believe our undeniable interest, fascination and fear of aliens and UFOs have something to do with it. We both fear aliens and UFOs, always have, and for no particular reason other than this childhood memory. You really can't have a fear of something for no reason; something has to generate that fear inside of you, and I believe maybe our memory of "Triangle Man" is that generator.
He was not very tall, but frail, with long, skinny arms and legs, with a slender face that was shaped like an upside-down triangle. His eyes were big and dark, and I also associate the color purple with him; not sure why. I can't remember even what color he was... maybe purplish... but despite his color, he scared me and scared my sister. We haven't seen him again since I was a child, nor my sister -- and we don't want to either.