Automatic breathing is done purely with your diaphragm. But there are a whole host of chest, neck, and head muscles that can assist. And you probably don’t even notice them. While asleep, all your muscles relax, and only your diaphragm moves. So those chest muscles creating extra inflation aren’t moving, the muscles holding your throat open are relaxed, and your tongue is left to partially slide into your airway. Sleep position can relieve some of it, but due to lots of reasons, some people are more prone to snoring and apnea in general
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