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.

2. Liver Problems

The liver plays a vital role in filtering toxins from the body. When it is inflamed or not functioning properly, toxins can build up in the system.

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.

3. Dehydration

A very common cause of nighttime dry mouth is simply not drinking enough water during the day. Even while sleeping, your body uses and loses water through breathing and other basic functions.

When your hydration levels are too low, your mouth can become dry. To prevent this, drink water consistently throughout the day.

4. Oral Diseases

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