Quote:
Originally Posted by glenntaj
I do have some problems at times with feeling sleepy early in the evening, especially during the short days of winter, and especially if a large evening meal is consumed--I've assumed this is part of my insulin resistance/reactive hypoglycemia, as well as having a seasonal component.
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That sounds like it could also be just melatonin. That would account for the seasonal change as daylight shortens and the large meals containing more tryptophan (and other enzymes).
Quote:
In mammals, melatonin is biosynthesized in four enzymatic steps from the essential dietary amino acid tryptophan, with serotonin produced at the second step. Melatonin is secreted into the blood by the pineal gland in the brain. Known as the "hormone of darkness," it is secreted in darkness in both day-active (diurnal) and night-active (nocturnal) animals.
http://en.wikipedia.org/wiki/Melatonin
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