Snoring. Illustration of a cross-section through the lower head showing the process of snoring. The uvula (shown in three positions at far right) is the fleshy protuberance at the back of the mouth. The movement of air during sleep is represented by the green arrows. The nose (at upper left) is blocked, perhaps due to congestion, and so the air can only partially enter. Instead air must enter and leave through the open mouth. This may lead to noisy vibrations of the uvula (shown by green lines), which are the cause of snoring. Snoring is more common when sleeping on the back, as the lower jaw has a tendency to drop open.
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