An explanation for lost sleep: Late circadian rhythms in those with attention-deficit hyperactivity disorder may make them natural night owls.Could ADHD be a problem caused by a disruption in circadian rhythms?It’s an area of research that some experts say holds promise for developing new treatments for attention-deficit hyperactivity disorder. Many adults and children diagnosed with ADHD report sleep problems. Some have difficulty falling asleep or staying asleep, and some develop sleep apnea.
https://www.wsj.com/articles/could-how-you-sleep-be-linked-to-adhd-1509984462
