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Day-time melatonin administration: effects on core temperature and sleep onset latency
K Reid1, C Van den Heuvel, D Dawson
1University of Adelaide, Department of Obstetrics and Gynaecology, Woodville, South Australia.
Journal of Sleep Research
|September 1, 1996
Summary
Daytime melatonin administration significantly lowered core body temperature and reduced sleep onset latency in young adults. These findings suggest melatonin may promote sleep by inducing hypothermia, potentially aiding sleep disorder treatment.
Area of Science:
- Chronobiology
- Sleep Medicine
- Neuroendocrinology
Background:
- Melatonin is known to induce hypothermic and hypnotic effects.
- A potential mechanism suggests that melatonin-induced core temperature decrease may mediate increased sleepiness.
Purpose of the Study:
- To investigate the relationship between melatonin administration, core body temperature, and sleep onset latency in young adults during daytime.
- To test the hypothesis that melatonin facilitates sleep onset through a hypothermic effect.
Main Methods:
- Sixteen healthy males received either 5 mg of oral melatonin or a placebo at 14:00 hours.
- Core body temperature was continuously monitored.
- Sleep onset latency (SOL1 and SOL2) was assessed using hourly Multiple Sleep Latency Tests (MSLT).
Main Results:
- Melatonin significantly decreased core body temperature for 6 hours post-administration compared to placebo.
- The drop in core temperature correlated with reduced sleep onset latency (SOL1 and SOL2).
- Mean SOL1 and SOL2 were reduced by 40% and 25%, respectively.
Conclusions:
- Daytime melatonin administration induces hypothermia and reduces sleep onset latency.
- These results support the hypothesis that melatonin may facilitate sleep onset via a hypothermic mechanism.
- Exogenous melatonin may be beneficial for treating sleep disorders linked to elevated core body temperature.