Twenty-one of the 33 patients and controls with possible ADHD underwent additional, objective psychological testing. Researchers have a few theories why the disorders appear to be linked. D., of Rutgers University in Piscataway, NJ . And being tired from having your sleep disrupted could cause people to be more inattentive. Another theory is that both disorders may be caused by a lack of dopamine in the brain.
Dopamine is responsible for transmitting signals within the brain.
A lack of dopamine can leave patients unable to control their movements normally. Evidence for this theory is that both disorders respond well to drugs that promote dopamine action in the brain. That way these disorders can be diagnosed and treated more effectively. The risk of ADHD or RLS is greater in people with a family history of the disorder.