Why do I wake up with a dry mouth?

Waking up with a dry mouth is common and often happens because saliva production naturally drops during sleep. If something else is also drying out your mouth, you may wake up feeling parched.

Common causes

1. Mouth breathing: This is a very common cause. Nasal congestion, allergies, a deviated septum, or sleep apnea can force you to breathe through your mouth, which dries it out.
2. Not enough fluids: Dehydration can contribute to dry mouth, especially if you’re not drinking enough during the day.
3. Medications: Many medications can cause dry mouth, including antihistamines, decongestants, blood pressure medicines, muscle relaxants, and antidepressants.
4. Dry air: Low humidity in the bedroom can make dryness worse.
5. Alcohol, caffeine, smoking, or vaping: These can irritate the mouth and contribute to dryness.
6. Age and health conditions: Dry mouth becomes more common with age, often because people take more medications, and it can also be linked to certain medical conditions.

What may help

• Drink water regularly during the day.
• Try a humidifier at night.
• Treat nasal congestion if that’s part of the problem.
• Use an alcohol-free mouthwash or a dry-mouth saliva substitute.
• Avoid alcohol, caffeine, and smoking close to bedtime.

When to get checked

Persistent dry mouth shouldn’t be ignored, because saliva helps protect your teeth and gums. If it doesn’t improve, or if you also have heavy snoring, daytime fatigue, trouble swallowing, or joint pain, it’s a good idea to see a doctor or dentist to check for causes like sleep apnea or Sjögren’s syndrome. Many medications can contribute to dry mouth, so if you suspect a medicine is involved, ask a pharmacist or clinician to review your list and see whether dry mouth is a known side effect.