<P> Delayed sleep phase disorder ( DSPD ) , more often known as delayed sleep phase syndrome and also as delayed sleep - wake phase disorder , is a chronic dysregulation of a person 's circadian rhythm ( biological clock ) , compared to the general population and relative to societal norms . The disorder affects the timing of sleep , peak period of alertness , the core body temperature rhythm , and hormonal and other daily cycles . People with DSPD generally fall asleep some hours after midnight and have difficulty waking up in the morning . People with DSPD probably have a circadian period significantly longer than 24 hours . Depending on the severity , the symptoms can be managed to a greater or lesser degree , but no cure is known , and research suggests a genetic origin for the disorder . </P>
<P> Delayed sleep phase disorder ( DSPD ) , more often known as delayed sleep phase syndrome and also as delayed sleep - wake phase disorder , is a chronic dysregulation of a person 's circadian rhythm ( biological clock ) , compared to the general population and relative to societal norms . The disorder affects the timing of sleep , peak period of alertness , the core body temperature rhythm , and hormonal and other daily cycles . People with DSPD generally fall asleep some hours after midnight and have difficulty waking up in the morning . People with DSPD probably have a circadian period significantly longer than 24 hours . Depending on the severity , the symptoms can be managed to a greater or lesser degree , but no cure is known , and research suggests a genetic origin for the disorder . </P>
i sleep better in the morning than at night
i sleep better in the morning than at night
Delayed sleep phase disorder
Delayed sleep phase disorder