I've definately had dreams (bad ones) where I wake up and can't move or talk for a couple seconds. I feel almost like a dead fish. Totally paralyzed and lifeless, but just laying there. What you described by saying your body turns on a paralysis state, makes sense. I've often wondered before why I haven't totally beat on someone I'm in bed with when I have a crazy dream about fighting someone, or why I don't YELL real loud when I do in a dream. That would explain why.