Not drinking enough fluids during the day can make dry mouth worse at night. Dehydration reduces the amount of fluid available for saliva production, so the mouth may feel dry while you sleep.
Signs that you may not be drinking enough include thirst, dark urine, dry lips, fatigue, headache, or feeling lightheaded. The source article lists thirst, dark urine, and fatigue as signs that dehydration may be contributing to dry mouth.
Try to drink water regularly throughout the day rather than drinking a large amount right before bed. Drinking too much late at night may increase bathroom trips and disturb sleep.
3. Medication Side Effects
Many medications can reduce saliva production. This is one of the most overlooked causes of dry mouth, especially in older adults or people taking several medicines.
