Eating certain types of food before bed—especially greasy, spicy, or salty foods—can irritate the digestive system. These foods absorb water and increase fat and blood pressure levels, which disrupt digestion during the night.
As your body continues to digest the food while you sleep, it pulls water from your system, leading to a dry sensation in your mouth.
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Mouthwash
2. Liver Problems

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One subtle sign of liver damage is persistent dry mouth during sleep. If this occurs frequently and without an obvious cause, it’s important to seek medical evaluation to check your liver health.