Written and medically reviewed by Kwaku Osafo-Mensah, MDPulmonary Medicine | Sleep Medicine | Diplomate, American Board of Sleep Medicine (ABSM)Medically reviewed: August 2026 Sleep apnea and oxygen levels are closely related. In many people, obstructive respiratory events cause repeated drops in blood oxygen during sleep. That can make an oxygen number on a sleep study—especially … Continue reading Sleep Apnea and Oxygen Levels: How Low Is Too Low?