That reminds me of the scene in the matrix where Morpheus is showing Neo the ropes in one of the earlier scenes. The matrix is like a dream world where the rules have been created by machines but can be broken by the mind. Morpheus asks Neo "do you think that is air you are breathing"? The point being that when in the dream, expectations of a typical reality gets in the way of fully realizing hidden potential. That is where belief comes in because when you believe you can do anything regardless of perceived limitations, that becomes reality.
So yeah, that is some excellent perspective to have going into your dreams. It will make a huge difference in the long run.