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Diagnosis of circadian rhythm sleep disorders Martinez D; Lenz Mdo C; Menna-Barreto LJ Bras Pneumol 2008[Mar]; 34 (3): 173-80Insomnia and excessive sleepiness are common in the investigation of sleep-disordered breathing. Circadian rhythm sleep disorders are perhaps the most often overlooked conditions in the differential diagnosis of these symptoms. Circadian rhythm sleep disorders manifest as misalignment between the sleep period and the physical/social 24-h environmental cycle. The two most prevalent circadian rhythm sleep disorders are delayed sleep phase (common in adolescents) and advanced sleep phase (common in the elderly), situations in which the sleep period is displaced to a later or earlier time, respectively. It is important to keep these two disorders in mind, since they can be confused with insomnia and excessive sleepiness. However, there are nine possible diagnoses, and all nine are of clinical interest. Since light is the principal cue used in synchronizing the biological clock, blind individuals and night-shift/swing-shift workers are more prone to develop circadian rhythm sleep disorders. In this article, the new international classification of circadian rhythm sleep disorders is reviewed.|Circadian Rhythm/*physiology[MESH]|Disorders of Excessive Somnolence/diagnosis/therapy[MESH]|Humans[MESH]|Melatonin/administration & dosage/metabolism[MESH]|Phototherapy[MESH]|Polysomnography[MESH]|Sleep Disorders, Circadian Rhythm/*diagnosis/etiology/therapy[MESH]|Sleep Initiation and Maintenance Disorders/diagnosis/therapy[MESH]|Sleep Stages/*physiology[MESH]|Work Schedule Tolerance[MESH] |
