(mid-afternoon to sunset)
(sunset to bedtime)
"Tryptophan is an α-amino acid that is used in the biosynthesis of proteins...It is essential in humans, meaning that the body cannot synthesize it and it must be obtained from the diet. Tryptophan is also a precursor to the neurotransmitter serotonin, the hormone melatonin, and vitamin B3."
“Tryptophan.” Wikipedia, Wikimedia Foundation, 23 Oct. 2022, en.wikipedia.org/wiki/Tryptophan.
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