@Archie Moses, glad my comment in the longest thread introduced you to the old hag component of sleep paralysis. I'll offer some further thoughts based on my own experience, and describe a couple of those experiences.
I never experienced the old hag, as far as I can remember, but very often I would feel that there was a malevolent entity in my bedroom. Pure evil. It would create a sense of dread to the nth degree. In the other thread I mentioned that sleep paralysis produced a level of terror that was indescribable, and that's what I was talking about, the terror was produced by the sense of an evil presence. I don't think it's possible for a human being to experience a fear that's greater then that. It's why I said I hated sleep paralysis.
The only time I decided not to fight it, not to try and break free, I stopped breathing altogether. I was convinced I was going to die, and resumed fighting for my life. It's always the most intense mental battle imaginable to break free from SP. A battle like no other, IMO.
I mentioned in the longest thread that it must have started in my childhood, and it was not an old hag sitting on my chest, but an elephant. I can just remember my parents rushing into my bedroom one night because I was screaming out for help.
But it was about age 14 or 15 that I had what is still one of the most unusual experiences, which I assume was SP, but for years I thought it was very real, and, to be honest, I still don't know, because it was different then all the terrifying examples of SP that plagued me through my 20's and 30's. I kept a notebook for my dreams and nocturnal experiences, and that one as a teenager went like this: I became conscious of the fact that I was suspended above my bed, by a beam of light that was striking me in the chest. This beam emerged from a diffuse ball of light floating outside my bedroom window. A voice, in my head, said, in a very firm way, like an order, "you will not tell anyone", and I was lowered to the bed. I fell asleep. The next morning, it was the first thing on my mind and I went to the window and wondered "was that a UFO? What the hell was that?".
I took that command "you will not tell anyone" very, very seriously. What would happen to me if I told anyone? I felt like I had woke up in the middle of something that I was not supposed to know had happened. Like what had happened before I was conscious of being paralyzed and held above my bed by that beam? So, as you can imagine, since I was interested in UFOs from a young age, I wondered along those lines. Remarkably, years later I was to marry a woman who had the most remarkable close encounter experience I ever heard, and about the same time, but that's another story, lol.
Anyway, eventually I came to realize that experience must have been SP, but, to be honest, I will always wonder.
Now, here's another experience that causes wonder to me. I was in the grip of SP, but this time my girlfriend, now my wife, was in the bed with me. I saw the silhouette of a woman floating above me. She extended her hand and sent a bolt of energy into me. It was very painful and electrical in nature. I broke free, and woke up. My wife was very agitated. What happened, she asked me. She then told me that I was lying on my back perfectly still, but that the whole bed was vibrating so violently, that she thought she was going to be thrown on the floor! That was the first, and only time, that I realized SP might actually involve some kind of psychic energy that could affect matter.
Anyway, in general, as I mentioned in the longest thread, partial out of body experiences were very common for me during SP. I know SP is a medical condition, and has a scientific explanation, but I am not convinced that seeing and feeling my "spirit legs" rising up toward the ceiling, seeing what seemed to be my spirit trying to leave my body during SP was not actually real. As anyone who has the experience can attest, when it happens, it's as real as real can be, and the terror can be off the charts...