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The sleep cycle, an integral part of human health, consists of several stages with distinct characteristics and functions. It begins with a transition from wakefulness to sleep, known as the light sleep phase, followed by the restorative deep sleep phase, essential for physical recovery and growth. The cycle concludes with the Rapid Eye Movement (REM) phase, characterized by high brain activity and vivid dreaming. Insomnia, a prevalent sleep disorder, involves difficulty falling asleep, staying...
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Related Experiment Video

Updated: May 28, 2026

Polygraphic Recording Procedure for Measuring Sleep in Mice
08:45

Polygraphic Recording Procedure for Measuring Sleep in Mice

Published on: January 25, 2016

Melatonin in animal models.

Paul Pévet1

  • 1Laboratoire de Neurobiologie des Rythmes, UMR 7518 CNRS-Université Louis Pasteur, Strasbourg, France.

Dialogues in Clinical Neuroscience
|October 29, 2011
PubMed
Summary

Melatonin, a pineal gland hormone, regulates daily and seasonal rhythms. Its "chronobiotic" effects on the circadian clock are being explored, with melatonin receptors being essential for its action.

Area of Science:

  • Neuroscience
  • Chronobiology
  • Endocrinology

Background:

  • Melatonin is a nocturnal hormone produced by the pineal gland.
  • Its secretion is regulated by the circadian clock in the suprachiasmatic nucleus.
  • Melatonin influences physiological processes and seasonal adaptations in mammals.

Purpose of the Study:

  • To investigate the role of melatonin in circadian timing.
  • To elucidate the molecular and cellular mechanisms of melatonin's chronobiotic effects.
  • To understand how melatonin interacts with the circadian clock.

Main Methods:

  • Review of existing literature on melatonin and circadian rhythms.
  • Analysis of studies on exogenous melatonin's effects on the circadian clock.
Keywords:
animal modelchronobiotic effectcircadian functionmelatoninseasonal function

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  • Exploration of molecular mechanisms and receptor involvement.

    • Main Results:

    • Melatonin exhibits chronobiotic effects, influencing the circadian clock.
    • The circadian clock is a key site for melatonin's action.
    • Melatonin receptors are necessary for these effects.

    Conclusions:

    • Endogenous melatonin plays a role in circadian organization.
    • Further research is needed to fully clarify melatonin's function in diurnal timing.
    • Understanding melatonin's chronobiotic effects is crucial for circadian biology.