Why Is My Mouth So Dry When I Wake Up?

Dry mouth is a common side effect of CPAP therapy. There are several possible reasons for this, including:

1. Breathing through your mouth: If your CPAP mask isn't fitting properly or is leaking, you may be breathing through your mouth instead of your nose, which can cause dryness.

2. Humidifier setting: If the humidifier setting on your CPAP machine is too low, the air being delivered may not have enough moisture to prevent dry mouth.

3. Medications: Certain medications can cause dry mouth as a side effect, which can be exacerbated by CPAP therapy.

4. Dehydration: If you are dehydrated, your body may not produce enough saliva to keep your mouth moist.

To reduce dry mouth, you can adjust the humidifier setting, use a chin strap to keep your mouth closed, drink more water, and talk to your doctor about any medications you are taking.