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[Case report: treatment of a patient with sleep phase advance disorder with phototherapy].

We report on a patient with a moderate form of a sleep-phase advance syndrome. As a biological correlate we found an early temperature and cortisol minimum before midnight, respectively. Light therapy during the evening hours (2500 Lux) given over 17 months induced a complete remission of the symptoms. The good treatment outcome could be maintained after the end of daily light therapy by only sporadic application.