Old 05-09-2017, 02:26 PM
  # 3 (permalink)  
BetterNow2017
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Join Date: Apr 2017
Posts: 60
According to the International Classification of Sleep Disorders, Revised (ICSD-R, 2001),the circadian rhythm sleep disorders share a common underlying chronophysiologic basis:

The major feature of these disorders is a misalignment between the patient's sleep-wake pattern and the pattern that is desired or regarded as the societal norm... In most circadian rhythm sleep disorders, the underlying problem is that the patient cannot sleep when sleep is desired, needed or expected.
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