... biologic regulation of circadian rhythms, sleep, mood, tumor growth, reproduction and even aging. It would seem that melatonin also appears to have some kind of important relationship to sleep-wake cycle regulation, possibly having to do with its effect of lowering body temperature. Falling asleep is associated with lowered body temperatures, and waking up for most people, once the sun has ... number of sunshine hours per day drop, and their moods come back up again as we move toward spring (Brezezinski, 1997; Tzischimsky, Dagan & Lavie, 1993). In humans, melatonin plasma levels peak be...

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