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

Smoking or using tobacco products irritates oral tissues and reduces saliva flow over time. Alcohol, especially in the evening, dehydrates the body and relaxes mouth muscles, promoting open-mouth breathing.

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Health guidelines consistently point out that cutting back on these can improve comfort during sleep.

7. Underlying Health Conditions That Affect Saliva
Some conditions, such as diabetes or autoimmune issues like Sjögren’s syndrome, can influence saliva production. These may lead to dryness that’s more noticeable at night.