Waking up with a dry mouth is common and doesn’t automatically mean you’re ill. It usually happens because saliva production falls during sleep or because you’re breathing through your mouth.
Common reasons
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Mouth breathing from nasal congestion, allergies, or a blocked nose
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Dehydration, especially after sweating or not drinking enough during the day
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Medications — including some antihistamines, antidepressants, blood-pressure medicines, and diuretics
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Snoring or obstructive sleep apnea, particularly if you also wake up gasping or choking
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Alcohol or tobacco use
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Diabetes, especially when accompanied by increased thirst and frequent urination
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Less commonly, conditions affecting the salivary glands, such as Sjögren’s disease
What may help
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Drink adequate water during the day.
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Treat nasal congestion appropriately.
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Sugar-free gum or lozenges can stimulate saliva.
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Limit tobacco and excessive alcohol.
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Maintain good dental hygiene because reduced saliva increases the risk of tooth decay and gum disease.
Don’t stop a prescription medicine because it may cause dry mouth; discuss alternatives with your doctor or pharmacist.
When to get checked
See a doctor or dentist if dry mouth is persistent or severe, or if you have difficulty swallowing, recurrent mouth infections, significant dental problems, or very dry eyes.
If you snore loudly, wake gasping/choking, or feel excessively sleepy during the day, ask a doctor whether sleep apnea should be evaluated.
