What is Delayed sleep phase disorder?
'''Delayed sleep phase disorder''' is a [[circadian rhythm sleep disorder]].<ref>{{cite web |url=http://www.mayoclinic.org/diseases-conditions/delayed-sleep-phase/basics/definition/con-20035242 |title=Delayed sleep phase |author=Mayo Clinic Staff|date=16 July 2014 |publisher=Mayo Clinic |access-date=13 September 2014}}</ref> It affects the [[Time|timing]] of sleep. It has an effect on the time when a person is most alert during the day. It also affects core body [[temperature]] rhythm and other daily rhythms. People with DSPD generally fall asleep after [[midnight]]. They have difficulty waking up in the [[morning]].<ref>{{cite web|url=http://www.healthcommunities.com/delayed-sleep-phase-syndrome/overview.shtml|title=DSPS Overview, Incidence and Prevalence|author=Stanley J. Swierzewski, III, M.D.|date=1 Dec 2000|publisher=Remedy Health Media, LLC.|access-date=13 September 2014|archive-date=8 October 2014|archive-url=https://web.archive.org/web/20141008023357/http://www.healthcommunities.com/delayed-sleep-phase-syndrome/overview.shtml|url-status=dead}}</ref> Affected people usually have normal need for sleep. This condition usually develops in [[childhood]] or [[adolescence]]. DSPD is a life-long condition. == References == {{reflist}} [[Category:Sleep disorders]] {{biology-stub}}