Heya FiftyFifty.
First of all let me start by saying that I'm not claiming I
know what happened to you but as I read your post it seemed very similar to my
experience with SP so just hear me out before completely rulling it out.
Yes, it can be very realistic -
extremely realistic on a physical level. I've had episodes when my most annoying
night buddy whispers
in my ear and I can actually feel his breath close against my ear. When he's choaking me I feel his fingers on my neck. There's also a woman that
lies right next to me and screams so loud that I get headaches - it is the loudest sound I ever heard or in this case thought I heard. Sometimes I get
spasms so out of control that I feel I'll die if I don't manage to stop. Sense of motion so realistic that I get nausea - just like going down a
roller coaster (I get free rides

). Strange people arguing right next to me and I never understand a word they're saying (which is probably the
most annoying thing about it... damn foreigns

). Also, the fact that you managed to move doesn't rule SP out - I've moved all the way out of the
room some times.
One thing is certain though - when I turn on the lights and go look for them there's nothing there
If you keep having these events and it is SP all I can tell you that might help is - once you accept them it stops being as freaky.