While saliva is crucial for maintaining oral health, excessive drooling during sleep—known as nocturnal sialorrhea—can be a source of concern for some individuals. Experts note that occasional drooling is generally harmless, but frequent or excessive instances may indicate underlying medical conditions. Causes can range from sleeping position and facial muscle weakness to neurological issues or certain medications. Typically, drooling stops when a person shifts position or becomes more aware. However, if drooling is persistent, disruptive, or accompanied by other symptoms like difficulty swallowing or facial weakness, consulting a healthcare professional is recommended. Diagnosis usually involves a physical exam and assessment of potential underlying causes.