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Updated: May 20, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
Published on: August 8, 2019
[Diagnosis and treatment in circadian rhythm sleep disorders]
Junichi Murakami1, Makoto Imai, Naoto Yamada
1Department of Psychiatry, Shiga University of Medical Science.
Abstract:
Circadian rhythm sleep disorders (CRSD) are characterized by misalignment between major sleep episode and desired sleep phase, or symptoms associated with internal desynchronization between endogenous circadian rhythm and overt sleep-wake rhythm. Endogenous circadian rhythm is mainly regulated by master circadian clock located in the suprachiasmatic nucleus. Light entrains the circadian clock according to a phase-response curve. Furthermore, social time cue affects human sleep-wake rhythm. Instructions concerning sleep hygiene including light environment play fundamental role for the treatment in CRSD. In addition, light therapy and oral melatonin administration have application to delayed sleep phase type. Diagnostic classification and treatment in each types of CRSD are reviewed in this article.
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