Vitamin D Deficiency in Patients Referred for Evaluation of Obstructive Sleep Apnea Vitamin D Deficiency in Patients Referred for Evaluation of Obstructive Sleep Apnea Download VAMONOS (Veterans Affairs’ Metabolism, Obstructed and Non-Obstructed Sleep) Study: Effects of CPAP Therapy on Glucose Metabolism in Patients with Obstructive Sleep Apnea A Restless Farewell in Changing Times: Advice for the Field of Sleep Medicine