Dr. Abida Ripley published a paper on the benefits of sustained martial arts activity for children who have been diagnosed with Attention Deficit (Hyperactivity) Disorder (AD/HD) on milehighkarate.com.  She states:

“Additionally, a sustained commitment to martial arts practice (or a sport) may result in the child and parent paying better overall attention to diet, sleep routines, and daily schedules, leading to a healthier, happier, and more predictable child (Abernathy, 1995).”

Read more here.