• Nippon Rinsho · Jul 2012

    [Melatonin as a regulator of human sleep and circadian systems].

    • Kazuo Mishima.
    • Department of Psychophysiology, National Institute of Mental Health, National Center for Neurology and Psychiatry.
    • Nippon Rinsho. 2012 Jul 1; 70 (7): 1139-44.

    AbstractMelatonin(N-acetyl-5-methoxytryptamine) is synthesized from tryptophan and is intensively secreted into the blood only in darkness (nighttime) by the pineal gland. Melatonin is not only the most reliable marker of internal circadian phase but also a potent sleep-promoting and circadian phase regulatory agent in humans. There is evidence that daytime administered melatonin is able to exhibit short-acting hypnagogic effect and phase-shifting of the circadian rhythms such that sleep timing and associated various physiological functions realign at a new desired phase. Under favor of these properties, melatonin and melatonin receptor agonists have been shown to be potent therapeutic agents for the treatment of circadian rhythm sleep disorders and some type of insomnia.

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