Self-discipline is a very conscious effort. But when one needs to be creative one needs to be operating out of the sub-conscious and the conscious mind. However, it seems a certain amount of distractions and randomness are needed for any truly great creative thinking. I think the goal is to balance the two. Therefore, if adding discipline to one area of your life might help it could be totally worth it, like how Einstein would wear identical clothing everyday to free his mind from the business of deciding what to wear...