I've experienced SP pretty much all my life. I also dream very vividly almost all the time. Sometimes i have lucid dreams in which I act as an explorer of what is possible. I can confirm that I dream in vivid color. I can feel acute pain in dreams that is not present when I awake. I can be free of pain even though going to sleep and waking up I might actually have a particular pain. I can see incredible detail in objects - things can seem more vivid than real life. Examining the veins of leaves of trees seems to be one I do often. I can speak foreign languages fluently in some dreams (although I suspect that it's probably some words I know combined with a fluent form of jibberish). I compose or hear some amazing music in dreams, although I have to really write down a few motifs soon after waking to capture any of it. I can smell things in dreams - smells that are not possible to have been present in the environment in which I was sleeping. People in my dreams can surprise me by things they say - for instance asking me a question to which I do not know the answer - and then they tell me the answer (but how can that be if everything is generated in my own brain?). Of course sometimes I can fly or jump long distances too. Those dreams are awesome when I can get a good measure of control over them.
On the original topic I get regular sleep paralysis and it never ceases to completely freak me out. I often think I might never get out of it. It also happens several levels deep "Inception" style. I get out of my sleep paraysis only to find myself being paralized in another dream. Those are the worst because I have no idea how many levels I might have to go through to get out. 3 is the maximum I can recall, but even after 2 you think it's going to go on forever. I think I see the room around me in perfect detail, but sometimes I might hear a person coming up the stairs and I can do nothing about it in my frozen state. Those are really bad.
Interestingly I have for a very long time had repeating fream about seeing strange phenomina in the sky. Things start off fairly normal, and then spacecraft or unidentified object appear, or distant brilliant galaxies appear to close in on the earth. I think Matt 24:29,30 got deeply lodged in subconscious a long time ago.
For all the scary stuff I wouldn't trade my dreams for anything. It's like a whole other existence at night that I look forward to.
FG