<P> Isolated drooling in healthy infants and toddlers is normal and may be associated with teething . It is unlikely to be a sign of disease or complications . Drooling in infants and young children may be exacerbated by upper respiratory infections and nasal allergies . </P> <P> Some people with drooling problems are at increased risk of inhaling saliva, food, or fluids into the lungs, especially if drooling is secondary to a neurological problem . However, if the body's normal reflex mechanisms (such as gagging and coughing) are not impaired, this is not life - threatening . </P> <P> Drooling or sialorrhea can occur during sleep . It is often the result of open - mouth posture from CNS depressants intake or sleeping on one's side . Sometimes while sleeping, saliva does not build up at the back of the throat and does not trigger the normal swallow reflex, leading to the condition . </P> <P> Other causes include: </P>

Why saliva comes out of mouth while sleeping
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