The Endocrine Society Jul 12 2025 Oxytocin, often called "the love hormone," may play a protective role in mood disturbances triggered by sleep loss and hormonal shifts during key reproductive transitions like postpartum and menopause, according to a study being presented Saturday at ENDO 2025, the Endocrine Society's annual meeting in San Francisco, Calif. Researchers at Brigham and Women's Hospital and Harvard Medical School studied the combined impact of sleep interruption and estrogen