You would think that once you become lucid, which you become conscious you have the abilty to make conscious decisions on your own accord. Opon knowing you are in a dream you can rule out double thinking. You know you are in a dream and that you have no restrictions and the world is your play ground.
This is simply the way it should be!!
However in our waking life we our brains have been conditioned over and over to have limitations. This is at times arouses your suspicion of what can and can't be done even though you know it is a dream.
So I think what you are saying, "believing two contradictory ideas at the same time."
I think that is what holds us back. Contradiction only leads to indecisiveness.