Obstructive sleep apnea (OSA) causes repeated pauses or reductions in breathing throughout the night, triggering drops in blood oxygen and frequent mini-arousals that sabotage quality sleep. The condition affects an estimated 80 million Americans, yet roughly 80 percent of cases go undiagnosed. Left untreated, OSA has been linked to serious long-term consequences, including heart disease, cognitive decline, diabetes, and an increased risk of car and workplace accidents driven by chronic fatigue.