Waking up with a bone-dry mouth or sore throat is one of the most common complaints from new CPAP users — and one of the easiest to fix once you know the cause.
Why it happens
Dry mouth usually happens when your mouth falls open during sleep, letting pressurized air rush past your lips and out through your mouth instead of your nose. That fast-moving air dries out your mouth and throat over several hours, even if your humidifier is running.
How to fix it
- Add or increase heated humidification. Most machines have adjustable humidity levels — move it up a notch or two before adding anything else.
- Try a chin strap. A simple strap under the jaw keeps your mouth closed if you're a nasal mask or nasal pillow user.
- Switch to a full-face mask. If mouth-breathing is persistent, a full-face mask covers both nose and mouth so leak air stays contained.
- Use heated tubing. It keeps air warmer and more humid from machine to mask, especially in dry or cold bedrooms.
- Treat nasal congestion separately. A stuffy nose often forces mouth breathing in the first place — see our nasal congestion guide.
🎟️ A chin strap or a properly fitted full-face mask solves most dry mouth cases. TheCPAPBox carries both — use code FRIEND5 at checkout.
Shop TheCPAPBox →See your doctor if: dry mouth persists despite humidification and a chin strap, or you notice signs of dehydration, dental issues, or gum pain that don't improve.
Related reading
How to Use Your CPAP →
Nasal Congestion & Dryness →