Hormone responsible for controlling the circadian rhythym.

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What is the mechanism by which Melatonin increases dream vividness and intensity in humans?

I'm looking at the wikipedia article on Melatonin and noticed that it mentions vivid dreaming caused by melatonin. I have the "Melatonin and the Biological clock" pamphlet referenced in the article, ...
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How much Melatonin does the Human Body release in the course of a Night?

I have found multiple sources giving slightly different indications as to the peak Melatonin production in humans. It appears that children between ages 5 and 10 may achieve peak Melatonin/blood ...
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Does sleep duration vary for animals based on time of the year?

I'm interested in the sleep patterns of wild animals, that still use sun for controlling their biological clock. Animals entrain their biological clock to the day/night cycle using light as the ...