When I realize I'm dreaming, I can control my dreams completely, go anywhere, do anything, fly by flapping my arms, make specific people appear, wake myself up, etc. But it's not really comparable to sleep paralysis at all. I've had regular dreams where I was paralyzed or weighted down, but that is nothing like sleep paralysis. With sleep paralysis there is a different level of detail, you can't tell that you are dreaming because it is soo realistic. Every detail in sight is as clearly present and detailed as when you are awake, sounds, smells, temperature, wrinkles in clothing, objects in your room, lighting, vehicles driving outside your house, etc. Its so real that when you really wake up, the only notable differences are the time of day, the fact you can move, and maybe the lack of the presence of a being that might have been in the sleep paralysis dream.