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Melatonin, Circadian Rhythms, and Sleep.

Irina V. Zhdanova1, Valter Tucci

  • 1Department of Anatomy and Neurobiology, Boston University Medical School, 715 Albany Street R-913, Boston, MA 02118, USA. zhdanova@bu.edu

Current Treatment Options in Neurology
|April 3, 2003
PubMed
Summary

Melatonin, a hormone regulating sleep and circadian rhythms, can aid insomnia and circadian disorders when used in low doses. However, high doses may disrupt the body

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Area of Science:

  • Chronobiology
  • Sleep Medicine
  • Endocrinology

Background:

  • Melatonin is intrinsically linked to the regulation of circadian rhythms and sleep-wake cycles.
  • Disruptions in these rhythms are associated with various sleep and mood disorders.

Purpose of the Study:

  • To examine the effects of melatonin on sleep onset, maintenance, and circadian rhythm phase.
  • To evaluate the therapeutic potential and risks of melatonin supplementation.

Main Methods:

  • Review of experimental data on melatonin's physiological effects.
  • Analysis of melatonin's impact on sleep architecture and circadian timing.
  • Consideration of dosage and timing in relation to efficacy and side effects.

Main Results:

  • Low-dose melatonin promotes sleep onset and maintenance without altering sleep architecture.
  • Melatonin administration can phase-advance or phase-delay circadian rhythms depending on timing.
  • Physiological doses are effective for insomnia and circadian rhythm disorders, especially in individuals with low endogenous melatonin.

Conclusions:

  • Melatonin is effective for sleep and circadian rhythm disorders when used appropriately.
  • High doses (>0.3 mg) can cause side effects and disrupt circadian mechanisms.
  • Concerns exist regarding melatonin's 'food supplement' labeling and lack of quality control.

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