Epidemiology
ASPD is a rare disorder. It affects both men and women equally and has been determined to have a strong genetic link with 40–50% of people related to someone with ASPD having it themselves. As stated below, several genes have been discovered to have links with this syndrome and the body's circadian rhythms. Although it can be impairing, the syndrome is not necessarily unhealthy; most people don't seek help unless it starts to severely impact their social life.
Read more about this topic: Advanced Sleep Phase Disorder