The durations of human melatonin secretion and sleep respond to changes in daylength (photoperiod).

  • Tobias Wehr
  • Published 1991 in
    The Journal of clinical endocrinology and…

Abstract

Seasonal changes in daylength (photoperiod) modify the duration of nocturnal melatonin (MT) secretion in many vertebrates. In some cases the changes in MT act as chemical signals that trigger photoperiodic induction of breeding and other seasonal phenomena. It is unclear whether, and to what extent changes in daylength modify the duration of human MT… (More)

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