MELATONIN
Melatonin SECRETED-BY PinealRespondingToHypothalamus
MelatoninSecretion REDUCED-BY ExposureToLight
Melatonin IS HibernationChemical
Melatonin RELATED-TO SeasonalAffectiveDisorder
SeasonalAffectiveDisorder IS WinterDepression
See Time, Temperature