Day-time melatonin administration: effects on core temperature and sleep onset latency

Journal of Sleep Research
K ReidDrew Dawson

Abstract

Significant hypothermic and hypnotic effects have been reported for melatonin at a wide range of doses. It has been suggested that this decrease in core temperature (Tc) following melatonin administration may mediate the observed increase in sleepiness. To test this, melatonin was administered to young adults during the day, and the concurrent effects on Tc and sleep onset latency (SOL) were recorded. Sixteen healthy males received either a 5 mg oral formulation of melatonin or placebo at 14.00 hours. Core temperature was recorded continuously. Sleep onset latency to stage 1 (SOL1) and stage 2 (SOL2) were recorded using an hourly multiple sleep latency test (MSLT). Compared with placebo, melatonin significantly decreased Tc 1.5 h after administration for 6 h. Between 15.00 and 18.00 hours, the drop in Tc was associated with a concurrent decrease in SOL1 and SOL2. Following administration mean SOL1 and SOL2 were reduced by 40 and 25%, respectively. In this study, daytime melatonin administration produced a significant decrease in Tc with a corresponding decrease in SOL. Taken together, these data are not inconsistent with the suggestion that melatonin may facilitate sleep onset via a hypothermic effect. In addition, this study p...Continue Reading

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