If your CPAP machine is making a gurgling noise, you may be dealing with a common problem called CPAP rainout.
CPAP therapy uses pressurized air to help keep your airway open while you sleep. Many CPAP machines also use a humidifier to add moisture to the air. When warm, humid air cools inside the tubing, water can condense and collect inside the hose or mask.
This moisture can cause:
- Gurgling or bubbling noises
- Water droplets inside the mask
- A damp or wet mask
- Interrupted sleep
- Discomfort during CPAP therapy
The good news is that several adjustments can help reduce CPAP rainout.
What Is CPAP Rainout?
CPAP rainout is condensation that forms inside the CPAP tubing or mask.
Your CPAP humidifier warms water and adds moisture to the air. As this warm, humid air travels through the tubing, it can cool down.
If the air cools enough, the moisture turns into water droplets. The water can then collect in the tubing or flow toward the mask.
This can create the familiar gurgling sound and may cause water to splash onto your face.
Why Is My CPAP Making a Gurgling Noise?
Several factors can contribute to CPAP gurgling.
1. The Room Is Too Cool
A cool bedroom can cause the warm, humid air inside the CPAP tubing to cool quickly.
The greater the temperature difference between the air inside the tubing and the room, the greater the chance of condensation.
2. The Humidity Setting Is Too High
A high humidifier setting adds more moisture to the air.
While humidity can help prevent a dry nose and throat, too much moisture can increase condensation.
If you are experiencing rainout, try lowering the humidity setting gradually.
If lowering the humidity causes nasal dryness or irritation, you may need to adjust the setting again.
3. The Tubing Is Too Cold
Standard CPAP tubing can allow humidified air to cool as it travels toward the mask.
Heated CPAP tubing can help maintain a more consistent temperature and reduce condensation.
Learn more about heated CPAP tubing.
4. Water Is Collecting in the Tubing
If condensation forms inside the hose, water can collect at low points.
As air moves through the tubing, the water may bubble or splash, creating a gurgling sound.
5. The Tubing Is Poorly Positioned
The way your CPAP tubing is positioned can affect where condensation collects.
Try to position the tubing so that water can drain away from your mask and back toward the humidifier.
How Do I Stop CPAP Rainout?
If your CPAP is making a gurgling noise, try these steps.
1. Lower the Humidifier Setting
Start by lowering your CPAP humidity setting slightly.
Reducing the amount of moisture in the air can decrease condensation.
However, avoid lowering the setting too much. Insufficient humidity can cause:
- Dry nose
- Dry throat
- Nasal irritation
- Congestion
The ideal setting depends on your comfort and the temperature of your bedroom.
2. Use Heated CPAP Tubing
Heated tubing helps keep the air warmer as it travels from the CPAP machine to your mask.
This can reduce the temperature drop that causes condensation.
If your CPAP machine supports heated tubing, ask your equipment provider or sleep specialist whether it is appropriate for your setup.
3. Use a Tubing Insulation Sleeve
A CPAP hose cover or insulating sleeve can help reduce heat loss from the tubing.
This can be especially useful if your bedroom is cool.
4. Adjust the Tubing Position
Position your tubing so that condensation does not collect near your mask.
If water has accumulated in the hose, disconnect the tubing from the mask and allow the water to drain before using the equipment again.
5. Keep the Bedroom From Getting Too Cold
A very cool bedroom can increase the chance of rainout.
If practical, maintaining a comfortable room temperature may help reduce condensation.
You do not need to make the room excessively warm. The goal is to reduce the temperature difference between the humidified air and the surrounding environment.
6. Consider the Position of Your CPAP Machine
Keep your CPAP machine on a stable, level surface and follow the manufacturer’s instructions for placement.
The tubing should be arranged so that condensation can drain away from the mask.
Never place the machine where accumulated water could enter the device.
If you are unsure how your machine and tubing should be positioned, check the manufacturer’s instructions or ask your equipment provider.
Can a CPAP Humidifier Cause Gurgling?
Yes. A CPAP humidifier can contribute to rainout when the humidified air cools inside the tubing.
However, the humidifier itself is not necessarily the problem.
Humidity can make CPAP therapy more comfortable by reducing dryness and irritation. The goal is to find a balance between enough humidity for comfort and too much moisture that causes condensation.
Learn more about using a CPAP humidifier.
What If There Is Water in My CPAP Mask?
If you notice water droplets inside your CPAP mask, you may be experiencing rainout.
Before your next use:
- Remove the mask from the tubing.
- Empty or drain any water from the tubing.
- Allow the equipment to dry according to the manufacturer’s instructions.
- Check your humidity setting.
- Check whether the tubing is positioned properly.
- Consider heated tubing or a hose cover if the problem continues.
Do not continue using equipment that is visibly damaged or malfunctioning. Contact your equipment provider if you are unsure whether the device is safe to use.
Additional Tips for Better CPAP Therapy
Solving rainout can make CPAP therapy more comfortable, but regular equipment care is also important.
Clean Your CPAP Equipment
Clean your mask, tubing, and humidifier chamber according to the manufacturer’s instructions.
Regular cleaning helps maintain the equipment and can reduce buildup of dirt and residue.
Check Your Mask Fit
A mask that does not fit properly can cause air leaks and discomfort.
If you frequently wake up with air blowing into your eyes, notice significant leaks, or cannot keep your mask comfortably sealed, ask your equipment provider or sleep specialist about adjusting the mask.
Check Your CPAP Filters
Inspect and replace CPAP filters according to the manufacturer’s recommendations.
A clean filter helps your equipment operate properly and supports good air quality.
Monitor Your Therapy
If your CPAP machine or app provides information about leaks, usage, or other therapy data, review it regularly.
Your sleep specialist can help interpret the information and determine whether your treatment needs adjustment.
When Should I Contact a Sleep Specialist?
Occasional condensation may be easy to correct with changes to your humidity, tubing, or bedroom temperature.
However, contact your sleep specialist or equipment provider if:
- Gurgling continues despite adjustments.
- Water repeatedly collects in your mask.
- Your CPAP therapy becomes uncomfortable.
- You frequently remove your mask because of moisture.
- You are experiencing significant air leaks.
- You are unsure whether your CPAP equipment is working properly.
- Your sleep apnea symptoms continue despite regular CPAP use.
A professional can evaluate your equipment, mask fit, tubing, and settings and help determine what adjustments may improve your therapy.
Why Is Effective CPAP Therapy Important?
CPAP is a common treatment for obstructive sleep apnea. It works by delivering continuous positive airway pressure to help keep the upper airway open during sleep.
Using CPAP consistently as prescribed can improve sleep apnea symptoms and help reduce the health risks associated with untreated obstructive sleep apnea.
If rainout, mask leaks, or other equipment problems make it difficult to use your CPAP regularly, talk with your healthcare provider rather than stopping therapy on your own.
Learn more about sleep disorder treatment at Enticare.
Key Takeaways
- A gurgling CPAP machine is often caused by condensation, also called rainout.
- Rainout occurs when warm, humid air cools inside the CPAP tubing and turns into water droplets.
- High humidity settings and a cool bedroom can increase condensation.
- Lowering the humidity setting may help, but too little humidity can cause nasal or throat dryness.
- Heated tubing and tubing insulation can help reduce condensation.
- Position the tubing so water can drain away from the mask.
- Keep your CPAP machine on a stable surface and prevent water from entering the device.
- Regular cleaning, proper mask fit, and filter replacement can help maintain comfortable CPAP therapy.
- Contact your sleep specialist or equipment provider if gurgling or water buildup continues.
If problems with your CPAP machine are making it difficult to use your therapy consistently, consider scheduling an appointment with a sleep specialist.
Visit Enticare’s Sleep Disorder Treatment page to learn more.
Frequently Asked Questions About CPAP Gurgling
Why is my CPAP making a gurgling noise?
A gurgling CPAP machine is often caused by rainout, which occurs when humidified air cools inside the tubing and creates condensation.
How do I stop my CPAP from gurgling?
Try lowering the humidifier setting, keeping your bedroom at a comfortable temperature, using heated tubing, insulating the hose, and positioning the tubing so condensation can drain away from your mask.
Can high humidity cause water in my CPAP tubing?
Yes. Higher humidity adds more moisture to the air, which can increase condensation when the air cools inside the tubing.
Does heated CPAP tubing help with rainout?
Yes. Heated tubing helps maintain the temperature of the air as it travels through the hose, which can reduce condensation.
Should I stop using my CPAP if there is water in the tubing?
If water has collected in the tubing, stop and drain the water before continuing. Check your equipment and settings to identify the cause. If water repeatedly accumulates or you are concerned that the machine has been exposed to water, contact your equipment provider or sleep specialist.
Can CPAP rainout affect sleep quality?
Yes. Gurgling noises, water droplets, and moisture in the mask can wake you during the night and make CPAP therapy uncomfortable.
Why does my CPAP only gurgle during certain nights?
Rainout can vary with bedroom temperature, humidity settings, tubing temperature, and the amount of moisture produced by the humidifier. A cooler room or higher humidity setting may make condensation more likely.
When should I see a sleep specialist about my CPAP?
Contact a sleep specialist or equipment provider if gurgling continues despite troubleshooting, water repeatedly enters your mask, your therapy becomes uncomfortable, or you are having difficulty using CPAP consistently.