While sleeping, our body’s natural reflexes slow down, including our swallowing mechanism. This can cause saliva to pool and escape from our mouth. But when this happens excessively, it often points to an underlying physiological issue.
Below, we dive deep into the biological mechanics of nighttime drooling (scientifically referred to as nocturnal sialorrhea), examine the normal versus abnormal spectrum of saliva production, and explore six health conditions that may be causing it.
The Biological Function of Saliva
To understand why we drool, we must first understand why our bodies produce saliva in the first place. Saliva is not just water; it is a complex, vital fluid produced by three pairs of major salivary glands (parotid, submandibular, and sublingual) alongside hundreds of minor glands scattered throughout the oral cavity.
Why Do We Need Saliva?
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Digestion: Saliva contains enzymes like amylase, which begin breaking down starches the moment food enters the mouth.
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Oral Defense: It washes away food debris and contains antibodies, antimicrobial peptides, and lysozymes that protect our teeth and gums from bacterial overgrowth.
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Lubrication: It facilitates smooth swallowing, speech, and taste perception by keeping the mucous membranes comfortably moist.
