Snoring With a CPAP? Why It Happens and How to Fix It

Here’s a scene a lot of CPAP users know. You finally got diagnosed, you finally got the machine, you’ve been strapping that mask on every night like a good soldier… and your partner nudges you at 2 AM because you’re snoring. Again. Through the mask.

Wasn’t the whole point of this thing to stop the noise? Short answer: yes, a properly set-up CPAP usually does stop the snoring that comes with sleep apnea. So if you’re still snoring with a CPAP, that’s not a normal side effect you have to live with. It’s a clue that something in the setup isn’t working the way it should, and most of the time it’s fixable.

I’ve been on CPAP since my sleep apnea diagnosis (I wrote about that whole journey in my sleep apnea post), and I went through three different mask styles before I found one that worked. So I’ve had plenty of nights fiddling with straps in the dark. In this post I’ll walk you through why snoring sneaks through a CPAP, how to figure out which cause is yours, and what to actually do about it, plus the signs that mean it’s time to call your sleep doctor instead of troubleshooting on your own.

Does CPAP Stop Snoring?

For most people with obstructive sleep apnea (OSA), yes. Snoring and apnea come from the same problem: the soft tissue in your throat relaxes during sleep and partly or fully blocks the airway. When air squeezes through that narrowed space, the tissue vibrates, and that’s the snoring sound. When the airway closes off completely, you get the breathing pauses.

A CPAP (continuous positive airway pressure) machine pushes a steady stream of air through your mask to hold that airway open. According to the Sleep Foundation, that steady pressure prevents the tissue collapse and vibration behind both the breathing pauses and the snoring, which is why CPAP can stop snoring associated with OSA. The catch is in that last part: it only works while the air is actually getting where it needs to go, at the right pressure, all night.

Two other things are worth knowing:

• CPAP is rarely prescribed just for snoring. The Sleep Foundation notes that doctors seldom prescribe it for people who snore but don’t have sleep apnea, and most insurers require an apnea diagnosis before they’ll cover it.
• Most snorers don’t have sleep apnea. As many as 44% of middle-aged men and 28% of middle-aged women snore regularly, but studies have found that less than a third of those snorers have OSA. If you snore and haven’t been tested, start with the fixes in my how to stop snoring guide and talk to your doctor about a sleep study, which could be a home sleep apnea test.

So if you’re already diagnosed and on CPAP and you’re still snoring, let’s figure out why.

Why You’re Still Snoring With a CPAP: The Quick Diagnosis

The Sleep Foundation’s guide to snoring with a CPAP, which is reviewed by a board-certified sleep physician, lists the usual suspects: pressure that’s too low, mask leaks or a worn-out mask, the wrong mask type for how you sleep, mouth breathing, nasal congestion, alcohol or sedatives, loose equipment, dryness, and body changes like weight gain. Here’s a cheat sheet to help you narrow it down before you start changing things.

Now let’s go through each one properly.

1. Mask Leaks: The Most Common Culprit

If air is escaping around the edges of your mask, the pressure inside your airway drops, and the tissue that CPAP is supposed to be holding open can start flapping again. A leak is also loud on its own.

Here’s what to check, based on guidance from Mayo Clinic’s tips for common CPAP problems and the Sleep Foundation:

• Fit it lying down. Your face changes shape when your head is on a pillow. Put the mask on, turn on the machine, lie in your normal sleep position, and then adjust. A well-fitted mask shouldn’t hurt or make leaking sounds.
• Look at the cushion. Silicone wears out and loses its seal over time. Mayo recommends checking the mask for cracks or stiffness. Follow your supplier’s replacement schedule for cushions and pillows rather than waiting until they fail.
• Get your fit checked. Mayo suggests having the fit checked yearly, and asking for a new size or style if your weight has changed. Mask sizes vary by brand, so a “medium” in one isn’t a medium in another.
• Tame the tubing. The American Thoracic Society’s PAP troubleshooting sheet suggests running the tube under your blanket across your chest so it doesn’t tug on the mask, or using a tubing holder. It also notes that raising the head of your bed may help prevent leaks.
• Check every connection. A loose elbow, a cracked tube or a filter cap that isn’t seated can all leak. Many newer machines show a leak reading, so use it.

2. The Wrong Mask for How You Sleep

This one got me. When I started, the mask that felt fine sitting up in the clinic kept shifting the moment I rolled onto my side. That’s why I went through three styles before landing on the nasal pillow mask I use now.

The Sleep Foundation points out that side and stomach sleepers often find a mask that presses into the pillow will shift and break its seal. Your options are basically:

• Nasal pillows: small cushions that sit at your nostrils. Minimal contact, good for side sleepers and people who feel claustrophobic. Not ideal if you breathe through your mouth.
• Nasal masks: cover the nose. A middle ground, and they pair well with a chin strap.
• Full-face masks: cover the nose and mouth. Usually the go-to for mouth breathers, though they’re bulkier and have more edge to leak from.

If your supplier offers a fit pack or a trial period, use it. Mayo’s advice is to contact your care team within the first few days if the fit seems wrong. Don’t spend months suffering with a mask that was never right for your face. A CPAP pillow with cut-outs for the mask can help side sleepers too, and if you’re shopping for a regular pillow, my guide to pillows for side sleepers covers what to look for.

3. Mouth Breathing

If you use a nasal mask or nasal pillows and your mouth falls open, the pressurized air takes the easy exit straight out of your lips. Pressure in your airway drops, your throat can partly collapse again, and you wake up with a mouth like the Sahara. The Sleep Foundation lists mouth breathing as one of the main reasons people keep snoring on CPAP.

It isn’t just about the noise, either. In a small Finnish study published in Chest (Bachour and Maasilta, 2004), researchers compared 51 people with sleep apnea who were heavy mouth breathers or mostly nose breathers. After a year, 71% of the nose breathers were using CPAP for more than four hours a night, compared with only 30% of the mouth breathers. It’s one study, but it fits what a lot of CPAP users report: when air keeps leaking out of your mouth, the therapy feels worse and you’re more likely to give up on it.

What helps:

• A chin strap. Both Mayo Clinic and the Sleep Foundation mention a chin strap to keep your mouth closed with a nasal mask. I use one on particularly dry nights, and it’s a cheap thing to try first.
• A full-face mask. If you mouth breathe most of the night, this is often the simpler fix.
• Fix the nose. People often breathe through their mouths because their nose is blocked. More on that next.

One caution: don’t tape your mouth shut under a CPAP mask on your own. Talk to your sleep doctor or equipment supplier about mouth breathing first, since they can see your leak data and suggest the right mask.

4. Nasal Congestion and Dryness

A stuffy nose pushes you toward mouth breathing, and dry air irritates your nose and throat, which can make snoring worse. CPAP airflow can dry things out on its own, especially in winter when the heat is running.

• Use the heated humidifier and adjust its level. Mayo also mentions heated tubing to cut down on dryness. Use distilled water in the chamber.
• Try saline spray at bedtime. Mayo suggests it for a dry, stuffy nose.
• Check for leaks first. A leaky mask can dry out your nose all by itself, so it’s worth fixing the seal before you blame the humidity.
• See your doctor for ongoing congestion. The Sleep Foundation notes that decongestants or cold medicine may help short term, but if your nose is blocked most nights (allergies, a deviated septum, chronic sinus problems), that needs a proper look. Check with your doctor or pharmacist before using any decongestant regularly, especially if you have high blood pressure.

5. Pressure That’s Too Low

If your mask seals well, your mouth stays shut, your nose is clear, and you’re still snoring, the pressure may simply not be enough to keep your airway open. Your needs can change over time, and a pressure that worked a year ago might not be right now.

The Sleep Foundation’s advice is to confirm your settings match your original prescription, and if snoring continues, ask your doctor about a new titration test. If the air feels too strong when you’re falling asleep, the ramp feature (which starts low and works up to your prescribed pressure) can help, and Mayo and the ATS both say to ask your provider whether an auto-adjusting or bilevel machine makes sense for you. The ramp was a big help for me in the early weeks.

What not to do: don’t go into the clinician menu and crank the pressure yourself. Too much pressure can cause its own problems, like more leaks, swallowing air and discomfort that makes you rip the mask off. Changing pressure is a medical decision. Most machines record your usage, leak and remaining breathing events, and your sleep team can download that data. I have follow-ups every six months where they do exactly that and adjust things when needed.

6. Alcohol, Sedatives and Sleep Position

Alcohol and sedating medications relax the muscles in your throat even more, which makes the airway easier to collapse. The Sleep Foundation recommends avoiding alcohol before bed and telling your doctor or pharmacist about any sedative medications. If you snore through your CPAP mostly on nights you had a few drinks, that’s your answer. Don’t stop or change a prescribed medication on your own, though; ask your doctor or pharmacist.

Sleep position matters too. On your back, gravity pulls your tongue and soft tissue backward, so sleeping on your side or raising the head of the bed a little can make the pressure’s job easier.

7. Weight Changes and Other Body Changes

The Sleep Foundation notes that weight gain, facial surgery or broken bones can change your airway enough to need different settings. Weight works in both directions. Since my diagnosis I’ve lost about 25 pounds, and my AHI has dropped a lot with CPAP. A change like that is exactly why regular check-ins with your sleep team matter: your mask size and your pressure may both need updating.

If you’ve gained weight, had surgery on your face or nose, or started snoring through the mask after an injury, don’t just troubleshoot at home. Tell your doctor.

When Snoring With a CPAP Means You Need Your Doctor

Some troubleshooting is fine to do yourself (fit, straps, chin strap, humidity, cleaning). But call your sleep doctor or clinic if:

• You’re still snoring after you’ve fixed obvious leaks and mouth breathing.
• Your partner notices pauses in your breathing, gasping or choking again.
• You’re sleepy during the day, waking up unrefreshed or getting morning headaches, the same symptoms you had before treatment.
• Your machine’s data shows your breathing events or leak creeping up.
• You’ve had a big change in weight, a new medication, surgery or an injury.
• You’ve had a stuffy nose most nights for weeks.

Snoring that comes back with those symptoms can mean your sleep apnea isn’t fully controlled, and your doctor may want to adjust your settings, switch your machine type or repeat a sleep study.

CPAP works best on top of good sleep habits, not instead of them. If you want a printable list of those habits, grab my free sleep checklist.

FAQ

Does CPAP stop snoring completely?

For most people with obstructive sleep apnea, a CPAP that fits well and is set to the right pressure stops the snoring, because it keeps the airway from collapsing and vibrating. If you still snore, it usually points to a leak, mouth breathing, congestion or a pressure problem rather than CPAP not working for you.

Is it normal to snore with a CPAP machine?

It’s common, but it isn’t something you should just accept. Snoring through the mask is a sign that something in your setup needs attention. Work through fit, leaks and mouth breathing first, then talk to your sleep doctor if it continues.

Can I turn up my CPAP pressure to stop snoring?

Don’t change your pressure yourself. Your pressure is prescribed, and too much can cause leaks and discomfort. Check that your settings match your prescription and ask your doctor about a re-titration or an auto-adjusting machine.

Will a chin strap stop snoring with a CPAP?

If mouth breathing is the problem, a chin strap can help keep your mouth closed with a nasal mask or nasal pillows. Mayo Clinic and the Sleep Foundation both mention it as an option. If it doesn’t help, a full-face mask may be a better fit.

The Bottom Line

Snoring with a CPAP is frustrating, but it’s usually a solvable problem. In my experience, it usually comes down to the boring stuff: a leaky or worn mask, the wrong mask for how you sleep, or a mouth that falls open. Fix those first. If the snoring sticks around, or the old symptoms come back, let your sleep team look at your data. Your partner will thank you.

This article is for general information and isn’t medical advice. Talk to your doctor or sleep specialist about any changes to your CPAP therapy.