ADHD is a genetic trait that is present at birth. It is the way a person's brain is wired. It allows people to think quickly, learn by doing, excel under pressure.
In adults with lack of REM sleep, often a Sleep Study will reveal various degrees of sleep apnea. People with this affliction may stop breathing as often as every 45-seconds, through the night. Thus, they awaken feeling drained, fatigued, and often with a dull headache from oxygen deprivation.
Sleep dysfunction should be addressed by a medical professional, since sleep apnea can increase incident of heart attack and stroke.