Since everyone else seems to be delurking in order to contribute to this topic, I thought I might as well follow the herd and add my experience of sleep paralysis.
It was quite a few years ago now, at the point when I'd gone from my youthful believing (In particular I was big on UFO conspiracy theories, as well as being a Christian) through a period in which I'd lost all interest in the paranormal and into a period where I had recovered interest and was moving toward my current state of highly skeptical.
Anyhow, at the time I'd been reading some book on the UFO phenomenon, which was mostly from a believers standpoint, but also included some entries on things such as sleep paralysis. It was the first time I'd ever heard of this and it (along with some of the more nightmarish "Type 3 encounters") was in my mind as I went to bed one night.
I'd been sleeping quite normally through most of that night but after waking to visit the toilet I had a somewhat strange prelude experience on the verge of going back to sleep - I could actually feel myself dropping asleep whilst still being aware of my surroundings. I felt my head rolling to the side on my pillow, began to dream (or at least experience dream like images) and generally felt like I was losing control of my body. It was not an entirely pleasant experience and after it happened led to the thought of "If this keeps happening I'm going to suffer sleep paralysis and think I'm being abducted by aliens". This was annoyingly accurate.
Now the experience itself. I'm fairly sure that both the above thought, and my knowledge of the classical abduction story led to it being as textbook "Alien Encounter" as it is:
I woke up and felt myself unable to move in the dark. This discovery gave me feelings of panic and terror. I noticed a blue light shining through the curtains. It periodically brightened and dimmed and this was accompanied by a mechanical humming noise that got louder in time with the light brightening and got quieter as it dimmed (for the noise think of a lightsaber humming). Looking around the room I could make out a shadowy figure in the corner, right on the edge of my vision. The figure seemed hostile to me, despite not taking any action at all during the experience. Now I knew exactly what was happening from the moment I woke up as the experience was so exactly like the explanation of sleep paralysis in my book, but this did nothing to stop the feelings of rising terror as the source of the blue light (presumably a spaceship. And since it's my ordeal, when I say it's a spaceship, it's a spaceship.) got closer and closer, causing both the blue light and humming to intensify. The experience then abruptly stopped, leaving my sitting there and blaming that bloody book for introducing me to the whole concept.
I didn't read that damn thing again for months.
