What Is Obstructive Sleep Apnea?
All types of sleep apnea are characterized by repeated pauses in breathing (or episodes of reduced breathing) during sleep. In particular, obstructive sleep apnea occurs when tissues in the upper airway, such as the tonsils or soft palate, block the free flow of air. This can happen as the muscles over-relax during sleep.
A healthy sleeper has fewer than 5 episodes of reduced/paused breathing per hour of sleep. People with mild OSA experience 5 – 15 episodes per hour, while moderate OSA is defined by 15 – 30 episodes per hour. People with severe OSA may stop breathing more than 30 times per hour. That can amount to hundreds of episodes in a single night!