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Certain conditions, including acid reflux, may also contribute to increased saliva production. Your body can produce extra saliva to help protect and lubricate the throat, which may lead to more noticeable drooling overnight.
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Occasional drooling is generally nothing to worry about. However, a sudden and persistent increase, difficulty swallowing, choking during sleep, or other unusual symptoms deserves medical attention. Otherwise, waking up with a little drool is simply a normal consequence of a relaxed body and peaceful sleep.