Why Does Your Mouth Feel Dry When You Sleep at Night? 8 Common Reasons to Understand

Keep your bedroom air clean with a HEPA filter to reduce allergens.
Try saline nasal sprays before bed to clear passages.
Elevate your head slightly with an extra pillow to help drainage.
But that’s not the full picture—let’s look at what you put into your body during the day.

2. Not Drinking Enough Fluids Throughout the Day
Dehydration is a straightforward but often underestimated cause. If your overall fluid intake is low, your body has less moisture to work with, and saliva production naturally drops at night when you’re not eating or drinking.

Caffeine or alcohol in the evening can contribute too, as they act as mild diuretics. According to health organizations, staying hydrated supports normal saliva function, which helps keep your mouth comfortable while you rest.

Aim for steady water intake during waking hours rather than large amounts right before bed to avoid nighttime bathroom trips.

Recurrent Rashes or Blisters on Lips or Private Areas