Retard de phase et psychopathologie

Delayed sleep phase syndrome presents with delayed sleep onset and difficulties waking up in the morning. When professional or social obligations compel patients to get up early in the morning, fatigue and daytime somnolence are inevitable. Without time constraints, patients are able to follow their own rhythm and vigilance remains normal. Delayed sleep phase syndrome generally starts in adolescence, probabty for biological reasons, but also due to behaviour changes which increase evening activities. Psychiatric disorders are often present, particularly personality disorders and/or depression. Recommended treatments include chronotherapy, light therapy and melatonin. There remains debate over treatment schedules. Results depend on the patients'motivation to change their sleep patterns and on their compliance with treatment.