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Gravity. When you sleep on one side, your maxillary sinuses drain - such that the one "above" drains into the one "below". This usually causes the sleeper to switch to the other side, so as to get relief - in reverse. Switching from one side to the other does actually help a little. When fluid in the sinuses is mobile, it tends not to congeal - and is "processed" better, limiting the problem, overall.

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14y ago

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