Do CPAP Machines Really Work? (2025)

What is a CPAP machine?

A CPAP (continuous positive airway pressure) machine helps treatsleep apnea. This device delivers continuous air through your mouth and/or nose to help keep your airways open while you sleep.

A CPAP machine includes:

• A mask that fits over just your nose or both your nose and mouth.
• Straps to position the mask on your face.
• A tube that connects the mask to the machine’s motor.
• A motor that blows air into the tube.
• An air filter that purifies the air entering your nose or mouth.

Some CPAP machines have other features as well, like heated humidifiers and adjustable pressure settings.

A CPAP machine is just one type of PAP (positive airway pressure) device. CPAP is the most common among these machines. Other types include:

• Auto CPAP: This device self-regulates, using a range of pressures to keep your airways open.
• Bi-level PAP: This machine uses two different pressures — a higher pressure while breathing in (inhalation) and a lower one while breathing out (exhalation).
• Auto-bilevel PAP: This machine self-regulates the inhalation and exhalation pressures
• Adaptive servo-ventilation (ASV): ASV is for people with certain types of central sleep apnea. ASV monitors your breathing and adjusts the pressures to make your breathing more stable. It may also deliver a breath when necessary.

What is a CPAP machine used for?

CPAP machines treat obstructive sleep apnea (OSA). In OSA, you briefly stop breathing while you sleep when your airways relax so much that they narrow down or completely close. This can happen hundreds of times in a single night, leading to a lack of oxygen. Untreated sleep apnea increases your risk for conditions like:

• Heart disease.
• High blood pressure.
• Stroke.
• Type 2 diabetes.
• Cognitive impairment.

Untreated OSA can also increase your risk of being in a vehicle accident while driving.

Using a CPAP machine when you sleep keeps your airways open, so you don’t stop breathing.

Healthcare providers use CPAP machines for other types of breathing problems. For example, they use it for preterm infants in the neonatal intensive care unit (NICU) whose lungs haven’t yet fully developed.

What does a CPAP machine do?

A CPAP machine takes in room air, then filters and pressurizes it before delivering it through a tube and into your mask. The continuous flow of air gently keeps your tongue, uvula and soft palate from shifting too far into your airway. This stabilizes your breathing and improves your overall sleep quality.

For the sleep apnea treatment to work, you must use your CPAP machine every time you sleep. This includes at home, while traveling and during naps.

You must also clean your mask and tube every day and refill your medical device prescription when necessary to replace the mask and tube.

Types of CPAP machines

CPAP machines mainly vary in the type of mask you can use with it. The kind that’s best for you depends on your comfort level, breathing habits and the type of sleep apnea you have. CPAP mask types include:

• Nasal mask: This option covers your nose. Healthcare providers often recommend a nasal mask if you move around a lot when you sleep.
• Nasal pillow mask: Rather than covering your entire nose, a nasal pillow mask only covers your nostril area. Some options also have prongs that fit into your nostrils. People who wear nasal pillow masks can wear their glasses comfortably.
• Full mask: This triangular mask fits over your nose and mouth. A full mask is best if you breathe through your mouth during sleep. Your provider may also recommend this type of mask if you have a nasal blockage.
• Hybrid mask: This is a type of full face mask that fits over your mouth and has prongs or cushions that seal your nostrils without covering the bridge of your nose.

Your provider will go over your options with you. They’ll also work with you to find the best type and fit of mask. Don’t hesitate to ask questions or voice your concerns. Some people end up trying a few different masks before they find the one that they like best.