Henry Ford Health System Sleep Researcher and founder of the System's Sleep Disorders and Research Center looks a sleep studies through the years and discusses what has been learned about the benefits of sleep and the negative impact a lack of sleep has on productivity and health. He explains that recent studies show a direct correlation between insufficient sleep and obesity and type 2 diabetes. He adds that some studies in children indicate that a sleep disorder and not ADHD is the reason for some children's hyperactivity.