[ahknight]

That's a whole different topic, even though to an outsider they may seem related by the stimuli concept. ADHD is an impulse control disorder. Increasing the stimulus levels of positive things around such a person induces a natural focus to those things. Reducing stimuli would alternately induce sleep or painful boredom that will express itself in highly random and chaotic ways after a short time.

Sometimes I think it would be a good idea to turn everything off and read a book. When I wake up after trying that I realize how many times I've tried it before and it's at least a few days before I get the idea again...