Drooling during sleep is common and usually harmless, often occurring when relaxed muscles in deep sleep cause the mouth to open and saliva to escape. Side or stomach sleeping, nasal congestion, or mouth breathing can increase drooling, while sleeping on your back helps reduce it. Though often minor, frequent or excessive drooling may signal issues like allergies, acid reflux, or sleep apnea. If persistent, it’s worth checking with a doctor—simple fixes like changing sleep position or treating congestion can help.
