Can You Die from Sleep Apnea? My Story and the Medical Truth

Before I say anything else, I want to be clear about who I am and what this article is. I’m not a doctor. I have no medical training whatsoever. What I am is someone who was diagnosed with severe obstructive sleep apnea in 2014, who found that diagnosis genuinely alarming, and who spent a lot of time afterwards reading about what untreated sleep apnea actually does to people. Everything in this post is based on that personal research, not clinical expertise. Please talk to a qualified doctor about your own situation rather than relying on anything I write here.

With that said, here’s the question I kept coming back to in the months after my diagnosis: could this actually kill me?

Why I Started Asking the Question

My AHI when I was diagnosed was 51. That means I was stopping breathing more than fifty times every single hour throughout the night. Once roughly every minute. My blood oxygen was dropping to 78 percent. My sleep specialist was not casual about any of this. He was measured and careful in how he explained it, but the message underneath was clear: this was not just about feeling tired. This was a serious medical situation that needed to be treated promptly.

I went home and, as I tend to do when told something alarming, I started reading. I wasn’t a medical professional trying to evaluate clinical trials. I was a patient in his forties trying to understand what was actually happening inside his body every night, and whether the thing happening was capable of killing him.

What I found was sobering enough that I’ve never once questioned whether wearing my CPAP every night is worth it. And I think it’s worth sharing, with the very clear caveat that I’m a person who read about this, not a person qualified to advise on it.

What I Found in the Research

The honest answer to the question, based on what I read as a non-medical person, is that sleep apnea rarely kills people directly and immediately in the way a heart attack does. What it appears to do instead is quietly damage your cardiovascular system over months and years until the conditions for something catastrophic are in place.

The mechanism I kept encountering was this. Every time your airway collapses during sleep and you stop breathing, your blood oxygen drops. Your heart, trying to compensate, works harder. Your brain detects the emergency and floods your system with stress hormones to force a partial awakening. Your blood pressure spikes. Then you resume breathing, fall back asleep, and the whole cycle starts again. In my case that was happening over fifty times an hour. My heart was being subjected to repeated stress responses all night, every night, for years before I was diagnosed.

What the research I found suggested is that this accumulates. The repeated oxygen drops appear to damage blood vessels throughout the body over time. The chronic blood pressure spikes contribute to hypertension. The ongoing cardiovascular stress increases the risk of heart disease, heart rhythm abnormalities, and stroke. I wrote about the stroke risk connection separately, and about how sleep apnea affects heart health more broadly, both from the same position of a patient who read about these things rather than a clinician presenting them.

The more acute risk I came across in my reading was something called sudden cardiac death, specifically the finding that people with severe untreated sleep apnea appear more likely to die suddenly during sleep, particularly in the early hours of the morning when apneas tend to be most frequent. A study published in the New England Journal of Medicine was one of the sources I kept coming back to on this point. The proposed mechanism is that the repeated oxygen drops and cardiovascular stress can trigger dangerous heart rhythm disturbances in people whose hearts are already compromised. I want to be careful about how I present this because I’m not qualified to assess how robust that research is or how it applies to any individual. What I can say is that reading it made a strong impression on me, and it was one of the things that made me take my treatment seriously from day one.

The Cases That Made It Real for Me

When I was reading around this topic, the cases that landed hardest were the ones involving real people whose deaths had been publicly attributed at least in part to sleep apnea complications.

Carrie Fisher, 1977; Carrie Fisher attends ‘Gravity’ premiere and Opening Ceremony during The 70th Venice International Film Festival.Credit : Getty(2)

Carrie Fisher died in December 2016, and the Los Angeles County coroner listed sleep apnea among the factors in her death alongside cardiovascular disease. She was 60. Reggie White, the NFL defensive player widely considered one of the greatest ever to play his position, died in his sleep in 2004 at 43. The medical examiner’s report listed cardiac arrhythmia alongside cardiovascular disease and sleep apnea. His widow afterwards spoke publicly about the fact that he had been diagnosed with severe sleep apnea but had struggled with consistent treatment. The American Academy of Sleep Medicine has been clear in its public guidance that severe, untreated sleep apnea carries serious cardiovascular risk, something his case brought into sharp focus for a lot of people who might otherwise have dismissed the condition as just loud snoring. Jerry Garcia, whose health declined significantly in the years before his death in 1995, had sleep apnea that friends and associates described as severe and untreated.

I’m not presenting these cases as medical analysis. I’m presenting them as a patient who read about them and found them affecting. What they shared, as far as I could tell from what was publicly reported, was severe, untreated, or under-treated sleep apnea alongside cardiovascular disease, which appears to have worsened. They were also all significantly younger than most people assume when they think of fatal cardiac events. Reggie White was 43. That’s the part that stayed with me.

What Happened in My Own Life

My blood pressure had been creeping upward before my diagnosis. My GP had noticed it and we were watching it. I had no satisfying explanation for why it was going up. Once I started CPAP and the nightly blood pressure spikes from each apnea event stopped happening, my blood pressure normalised within a few months without any medication. Whether the CPAP was directly responsible for that I can’t say with certainty, I’m not qualified to establish causation. But the timing was significant enough that both my GP and my sleep specialist noted it.

The migraines I’d been having every morning disappeared after my first properly treated night. Not gradually. The morning after I started CPAP I woke up without one, and they haven’t come back in over a decade. I had been stopping breathing so many times per night that my blood oxygen was chronically low, and the headaches were, I believe, at least partly a consequence of that. Starting CPAP and keeping my oxygen stable through the night resolved them completely.

Before my diagnosis I drifted on the motorway once. I wasn’t drunk, I wasn’t doing anything reckless, I just didn’t have enough cognitive and physical reserves to stay reliably alert and for a second I wasn’t. A horn from another car brought me back. That incident, which I thought about very differently after understanding what was happening to me every night, is the reason the drowsy driving aspect of this topic matters to me personally. People with untreated sleep apnea are dangerously sleepy during the day in ways they often don’t fully register because they’ve normalised their baseline. The road risk is real and it’s not only about the person in the car with the condition.

What the Treatment Did

I use a ResMed AirSense 10 with a full face mask. My AHI on therapy sits consistently under 2. My overnight blood oxygen stays in the healthy range. My blood pressure is normal. The exhaustion, the fog, the migraines, the irritability that had settled over my life like a weather system are gone.

I don’t say this to present CPAP as a miracle. The first two weeks were genuinely difficult. The mask felt strange, the pressure felt intrusive, and I had the early problems with leaks and dryness that most new users go through. What kept me going through that adjustment period was knowing what the alternative looked like, both in terms of the research I’d read about long-term cardiovascular damage and in terms of the specific picture from my own sleep study of what was happening to my body every night.

The adjustment period is temporary. The protection, as best I can understand it from what I’ve read as a non-medical person, is cumulative. Every night I use the machine is a night my cardiovascular system isn’t being subjected to the kind of repeated stress my sleep study showed it had been under for years.

What I’d Say to Someone Who Is Sitting on a Diagnosis

If you’ve been diagnosed with sleep apnea and are in the phase of wondering whether treatment is really necessary, whether the machine is really worth the inconvenience, whether you can just monitor things for a while, I can’t give you medical advice because I’m not qualified to give it. What I can tell you is what I found when I read about this, and what I concluded from my own experience.

The research I came across as a patient suggested that the damage from untreated sleep apnea is slow and cumulative rather than fast and obvious. You don’t necessarily feel the cardiovascular stress happening. You don’t feel the blood pressure spikes during the night. You just gradually accumulate risk in silence while explaining your symptoms away as stress or age or lifestyle. The cases I read about involving people who died from complications connected to sleep apnea weren’t people who had dramatic warning signs they ignored. They were people for whom the condition had been quietly doing damage in the background.

If you haven’t been diagnosed but you’re recognising the symptoms, the exhaustion that sleep doesn’t fix, the morning headaches, the snoring with gaps, the fog, please talk to your GP. An at-home sleep apnea test is much simpler than most people expect and gives you actual data. A full sleep study goes further if needed. Getting a number on what’s happening while you sleep is the starting point for everything else.

I am not medically trained and this entire article is one person’s reading and experience, not clinical guidance. But that reading and experience was enough to make me take this condition very seriously, and I’ve been grateful for that every morning for over ten years.

⚠️ 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).