The grouping of circadian rhythm sleep disorders dates back to the Diagnostic Classification of Sleep Disorders in 1979 , based on a shared cardinal feature: all these disorders represent one form or another of initial misalignment between the patient’s sleep and wake behaviours and that which is desired or regarded as the societal norm. In this Classification the circadian rhythm sleep disorders were divided into two groups, transient and persistent disorders. Nowadays, in the International Classification of Sleep Disorders , this subdivision has not been retained. However some of these disorders are only of an extrinsic type whereas the others depend on intrinsic and extrinsic factors (table 36.1).
KeywordsTransportation Cortisol Melatonin Blindness
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