Excessive drooling—especially during sleep—can signal more than just a minor issue. It may indicate sleep apnea, where open-mouth breathing causes saliva buildup, or acid reflux, which triggers excess saliva to neutralize stomach acid. Allergies and sinus infections can block nasal airflow, forcing mouth breathing, while neurological conditions like Parkinson’s disease or a stroke can weaken muscle control needed to swallow. If drooling is frequent, sudden, or worsening, consult your doctor prom