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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
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Related Experiment Video

Updated: May 3, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
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[Circadian rhythm sleep disorder].

Kazuo Mishima1

  • 1Department of Psychophysiology, National Institute of Mental Health, National Center for Neurology and Psychiatry.

Nihon Rinsho. Japanese Journal of Clinical Medicine
|January 21, 2014
PubMed
Summary

Chronotherapy, using bright light and melatonin, effectively treats circadian rhythm sleep disorders (CRSDs) by realigning the body's internal clock with desired schedules. These treatments help correct sleep-wake cycle misalignments.

Area of Science:

  • Sleep Medicine
  • Chronobiology
  • Neuroscience

Context:

  • Circadian rhythm sleep disorders (CRSDs) arise from a mismatch between the internal biological clock and external schedules.
  • CRSDs encompass various types, including delayed/advanced sleep phase, shift work, and jet lag.
  • The core issue is often a misaligned circadian rhythm phase or a malfunctioning circadian pacemaker.

Purpose:

  • To outline the pathophysiology and classification of CRSDs.
  • To highlight chronotherapy as a key treatment strategy for CRSDs.
  • To emphasize the role of zeitgebers, specifically light and melatonin, in managing these disorders.

Summary:

  • CRSDs result from circadian misalignment or pacemaker dysfunction.
  • Chronotherapy, utilizing potent zeitgebers like bright light and melatonin, is effective when timed correctly.

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  • Bright light therapy and timed melatonin administration can shift sleep-wake cycles to correct misalignments.

    • Impact:

    • Provides a concise overview of CRSDs and their management.
    • Highlights effective chronotherapeutic interventions for sleep-wake cycle regulation.
    • Emphasizes the importance of precisely timed light and melatonin for treating CRSDs.