It's crazy, crazy shit. I find it most fascinating for the scary element that almost always brings. People describe feeling held down. Not just paralysed but physical pressure on their arms or torso's. Some people experience being fucking raped but some invisible beast, really scary.
this, completely. I am fascinated by the terror of it in my own twisted way. I just recall an intense feeling of danger, but vague and ill-defined; it is like dreams coincide with reality, but you are aware of both... for example, I sleep in a downstairs bedroom at the front of my house. I was convinced that people were right outside the window about to smash it in, but at the same time I knew I was dreaming, and I was trying desperately to move/wake myself up, but I was frozen.
I also remember my breathing becoming very intense and rapid, it's usually the only thing I can control, it's how I've woke my girlfriend up next to me - who then wakes me up, which stops the nightmare, and it's all fine.
It's such a strange experience.