What you can do in a dream is all based exclusively on what you believe. In order to do more things in a dream you must believe you can do them. I know the word has a religious meaning, but it's really faith. Pure and simple. With faith you can move mountains.
Have you ever had a dream, Neo, that you were so sure was real? What if you were unable to wake from that dream? How would you know the difference between the dream world and the real world? Morpheus