4. Neurological disorders (Parkinson’s disease, MS, ALS)
Reason: These disorders can affect the nerves and muscles responsible for swallowing (dysphagia), causing saliva to accumulate and leak during sleep.
Signs: Tremors, stiffness, balance problems, changes in speech or coordination, progressive weakness.
5. Sleep apnea or obstructive breathing problems
Why: Mouth breathing during sleep—common in sleep apnea—can lead to increased salivation. It is often a sign of narrowed airways in the nose or throat.
Signs: Loud snoring, shortness of breath at night, daytime fatigue, morning headaches.
6. Cardiovascular or neurological events (stroke, TIA)
Reason: A blockage or bleeding in the brain can impair muscle control, including the swallowing and facial muscles. This can lead to excessive salivation on one side of the body during sleep.
Signs: Sudden drooping of the face, weakness in the arm, slurred speech, confusion, dizziness. This is a medical emergency.
