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Delayed sleep phase syndrome (DSPS) is one of many circadian rhythm

Most people crossing more than one time zone in a westward direction (for example, from New York to Los Angeles), will experience symptoms similar to those of Advanced Sleep Phase Syndrome [see related section above]. Eastbound travelers (from the US to Europe, for example) will experience symptoms similar to those of Delayed Sleep Phase Syndrome [see related section above].Symptoms of jet lag can be alleviated, and quick adaptation to the new time zone can be achieved by using or avoiding light at various

DSPS is characterized by a persistent inability (&ampgt6 mo) to fall asleep and awaken at accepted times. Once asleep, these patients are able to maintain their sleep and have normal total sleep times. In contrast, patients with insomnia have a lower than normal total sleep time due to difficulties in initiating or maintaining sleep. (See Etiology, Prognosis, Presentation, Workup, Treatment, and Medication.)

A person with this condition does not sleep for an extended period of time. Instead, they may take brief naps throughout the day. It is characterized by at least three sleep episodes per day, occur at varying times. Symptoms include a chronic inability to sleep and excessive sleepiness. Neurological disorders, such as dementia, can contribute to this condition.Disruptions of one or more of these factors can lead to a circadian rhythm sleep disorder.

Many older adults with chronic delayed sleep phase syndrome often lament that behavioral treatments do little to nothing for them. Indeed, some sufferers have much more difficulty phase advancing their biological clocks than others.

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