Why do you slobber on are pillow when we sleep?

Slobbering on a pillow during sleep can occur for several reasons, including sleeping with your mouth open, which may be caused by nasal congestion or sleep apnea. Saliva production continues even when you're asleep, and without swallowing, it can accumulate and lead to drooling. Additionally, certain sleep positions may exacerbate the issue, causing saliva to escape. It's usually harmless, but if it's excessive, it might be worth consulting a healthcare professional.