Troubleshooting CPAP Problems: Guide to a Better Night’s Sleep
When you start using your new CPAP machine, you don’t think of the problems that you might encounter down the track.
Three weeks into CPAP therapy, I woke up at two in the morning to a hissing sound and a mouth so dry it felt like I’d been chewing on cardboard. My mask had shifted, air was blowing directly into my eyes, and I was seriously considering launching the whole setup out the window. I didn’t, obviously. But I thought about it.
What nobody tells you when you first get diagnosed and sent home with a CPAP machine is that the first few weeks are an exercise in patience. The therapy itself is straightforward enough: the machine pushes pressurised air through a mask to keep your airway open, you breathe normally, and you stop having dozens or hundreds of apneas every night. But getting to that smooth outcome involves working through a few problems first, and most people hit at least some of them.
I’ve been using my ResMed AirSense 10 for well over a decade now. In that time, I’ve dealt with mask leaks, rainout, dry mouth that didn’t respond to anything for weeks, air in my stomach, a cracked humidifier chamber that soaked my bedside table, and enough general fiddling with settings to fill a small manual. The reassuring thing I can tell you from the other side of all of that is that virtually every common CPAP problem has a fix. You just need to know what you’re looking for.
Mask Leaks
This is probably the most universal CPAP complaint, and it’s where I’d start if something feels off. A leaking mask makes noise that can wake you or your partner, reduces how effective your therapy is, and if the air is escaping toward your face, it can dry out your eyes and make sleeping genuinely uncomfortable.
The counterintuitive thing I learned early on is that tightening your straps usually makes leaks worse rather than better. I made that mistake myself when my mask started leaking after a couple of months. Clamping the headgear down harder distorts the cushion, which actually breaks the seal. What fixed it was replacing the cushion entirely. Face oils degrade the silicone faster than most people realise, and a cushion that looks fine to the eye can still have lost enough of its integrity to stop sealing properly. I replace mine every two to three months now and calendar it so I don’t forget.
The other thing worth trying is fitting your mask while lying down in your actual sleeping position rather than sitting up in front of a mirror. A seal that looks perfect when you’re upright can open up completely when you turn onto your side or stomach. I also started using mask liners, which are thin fabric inserts that sit between your skin and the cushion. They made a noticeable difference to both the seal and the skin irritation I was getting around my nose. If you’ve tried all of this and the leaks are still there, it may be that your mask style isn’t the right fit for your face shape, and it’s worth going back to your supplier to try something different. My full breakdown of why CPAP masks leak goes into more detail if you need it.
Dry Mouth
Waking up with a mouth like sandpaper was one of my earliest and most persistent problems. I’m a mouth breather, which is a big part of it. When you use a nasal mask, and your mouth falls open during sleep, the pressurised air effectively bypasses the mask and creates a wind tunnel through your mouth all night. The result is exactly as miserable as it sounds.
If you’re a mouth breather using a nasal mask, the most direct solution is switching to a full face mask that covers both your nose and mouth. That’s what I did, and it made an enormous difference. The other change that helped just as much was actually using my heated humidifier properly. Modern CPAP machines have one built in, but I’d been leaving it on low settings because I hadn’t really understood how much it mattered. Turning it up and adding heated tubing keeps the moisture in the air all the way from the machine to the mask rather than letting it condense in the hose before it reaches you. I cover more of the specifics in my post on CPAP dry mouth if this is your main issue.
Rainout
If you’ve ever been woken up by water droplets hitting your face through your CPAP mask, you’ve experienced rainout, and you’ll know there are few ruder awakenings. What’s happening is that warm, humid air from your machine cools down as it travels through the hose, and the moisture condenses into actual water droplets that then travel toward your mask.
The most effective fix is heated tubing, which keeps the air temperature consistent along the whole length of the hose so the moisture stays as vapour rather than becoming condensation. My ResMed has this built in, and it solved the problem completely. If your machine doesn’t have that option, a hose cover that insulates the tubing works reasonably well as an alternative. You can also try turning your humidity setting down slightly, since less moisture in the air means less potential for condensation, though for me that created a trade-off with dry mouth that wasn’t worth it. There’s a more detailed walkthrough in my CPAP rainout guide.
Pressure That Feels Wrong
If breathing against your CPAP feels like a battle, whether that’s struggling to exhale or feeling like you’re not getting enough air, the settings are worth looking at carefully. The one thing I’d say firmly is don’t adjust your prescribed pressure without talking to your doctor first. That number came from your sleep study and your titration for a reason.
What you can adjust yourself is the ramp function, which starts the machine at a lower pressure and builds up gradually to your prescribed setting over the first twenty minutes or so while you’re falling asleep. I use this every single night. It makes the transition into sleep much more comfortable than being hit with full pressure the moment you put the mask on. Most ResMed machines also have EPR, which stands for Expiratory Pressure Relief and reduces the pressure slightly when you breathe out. It makes exhalation feel more natural. I’ve had mine enabled for years. If you want to understand the numbers behind your settings, my post on CPAP pressure settings explains it all without getting too technical.
Swallowing Air
This one took me a while to identify because it doesn’t feel like a CPAP problem at first. You just wake up bloated, gassy, uncomfortable, and not sure why. What’s happening is that during sleep your muscles relax and air can travel down your oesophagus instead of your lungs. It’s more common at higher pressure settings and tends to be worse when sleeping on your back.
The thing that helped me most was simply changing my sleep position. Sleeping on my side reduced it significantly, probably because the geometry of your throat and oesophagus is just better aligned when you’re not lying flat on your back. If it’s persistent and genuinely disruptive, it’s worth raising with your sleep specialist, since in some cases a switch to a different machine type can help by reducing the overall pressure you need. I wrote about this in more detail in my post on why CPAP makes me burp, which sounds like a slightly odd article title, but answers a question a lot of people quietly have.
Noise From the Machine or Mask
A well-functioning CPAP machine should be almost silent. If yours is making an unusual noise, the filter is usually the first thing to check. A clogged filter forces the motor to work harder, and you can hear it. I replace disposable filters every few weeks and wash the reusable ones regularly, and that handles almost all noise issues before they start.
Other sources of noise include loose connections where the hose meets the machine or the mask, water gurgling in the hose, or the machine vibrating against a hard surface. If you’re hearing gurgling, that’s the rainout issue described above. For vibration, putting a small folded towel or silicone mat under the machine dampens it effectively. If it’s your mask making noise, check that the vent holes in the mask are clear and haven’t been blocked or damaged.
Claustrophobia and Anxiety
This is one that doesn’t get talked about enough, especially in the first few weeks. Wearing a mask strapped to your face in the dark is a strange sensation for most people, and for some it’s genuinely distressing. I’ve seen people on CPAP forums describe ripping their masks off in their sleep repeatedly without even waking up, which is your brain making a pretty clear statement about how it feels about the situation.
If this is where you are, the main thing that helps is exposure over time in low-stakes situations. Wearing the mask while reading or watching something in the evening, with the machine running at low or ramp pressure, lets your brain start associating the mask with neutral experiences rather than bedtime stress. Starting with a less intrusive mask style helps, too. Nasal pillows are the smallest and least claustrophobic option, and some people find it worth starting there even if they eventually move to a different style. I have a longer post on overcoming CPAP anxiety if this is the issue that’s keeping you from sticking with therapy.
Keeping On Top of Maintenance
Most CPAP problems I’ve had over the years trace back to equipment that needed cleaning or replacing. The maintenance side of this isn’t complicated but it does require consistency. I rinse my mask cushion every morning, do a proper wash of the mask, headgear, and hose every week, and clean the humidifier chamber at the same time. The full guide to how to clean a CPAP machine walks through it step by step if you want a clear routine to follow.
Replacement schedules matter just as much as cleaning. Mask cushions should be replaced every one to three months, depending on how quickly your skin oils break them down. Headgear straps stretch and lose their tension around the six-month mark. Hoses develop micro-tears over time that you can’t always see, but that show up as leaks and pressure inconsistencies. The full breakdown of what needs replacing and when is in my CPAP replacement schedule guide. It’s not the most exciting reading, but following it means you spend a lot less time troubleshooting.
One other thing on the maintenance side: always use distilled water in your humidifier. Tap water and even bottled water leave mineral deposits in the chamber over time that are difficult to clean and can affect how the humidifier performs. A litre of distilled water costs almost nothing and lasts me about a week.
When to Get the Machine Itself Checked
Most CPAP machines last five to seven years with reasonable care, and most problems during that time come from parts wearing out rather than the machine itself failing. But if you’re getting repeated error messages, the motor is making noise even with a fresh clean filter, or the machine consistently struggles to hold your prescribed pressure, it might be signalling something more serious. I went into more detail on the warning signs in my post on how long a CPAP machine lasts.
The Honest Truth About Sticking With It
The early weeks of CPAP therapy have a way of making you question whether it’s worth the trouble. The mask, the straps, the noise, the dryness, the pressure, the leaks. It’s a lot to adjust to all at once. But almost every problem I’ve described here has a practical fix, and the fixes are usually simpler than they seem when you’re lying awake at two in the morning, wondering what’s gone wrong.
The gap between how I felt before treatment and how I feel now is enormous. That’s not something I can fully put into words, but it’s the reason I’ve stuck with this for over a decade and will keep going. If you’re in the troubleshooting phase right now, keep going. The right combination of equipment and settings is there; you just have to work through to it.
⚠️ MEDICAL DISCLAIMER This blog provides general information only and is not a substitute for professional medical advice, diagnosis, or treatment. Sleep apnea is a serious condition, and CPAP equipment should be used under proper medical supervision. Always consult your doctor or sleep specialist before starting, stopping, or changing any therapy. I share personal experiences as a CPAP user, not as a medical professional. Individual results vary. For medical guidance, please consult a qualified clinician or the American Academy of Sleep Medicine (aasm.org).
