Endocrine Abstracts

Background: Sleep loss in the early morning has been shown to reduce secretory activity of the pituitary–gonadal axis in men, but the determinants of this effect are unknown.Objective: To assess the effects of sleep restriction on serum concentrations of LH, testosterone , and prolactin (PRL).Methods: Fifteen young, healthy men were examined in a condition of sleep time restriction to 0245–0700 h for two consecutive night...