Obstructive Sleep Apnea With Dr. Stephanie M. Stahl

Obstructive sleep apnea affects approximately one in four adults and is especially common among patients with neurologic disorders, including stroke, Parkinson disease, dementia, epilepsy, and neuromuscular conditions. In this episode, Dr. Stephanie Stahl discusses why neurologists should routinely screen for OSA, highlights key symptoms and risk factors, reviews important considerations when interpreting sleep studies, and outlines current treatment options beyond CPAP. Learn how recognizing and treating sleep apnea can improve quality of life, optimize management of neurologic disease, and reduce long-term health risks.

In this episode, Aaron L. Berkowitz, MD, PhD, FAAN, speaks with Stephanie M. Stahl, MD,

FAASM, author of the article "Obstructive Sleep Apnea" in the Continuum® August 2026 Sleep Neurology issue.

Dr. Berkowitz is a Continuum® Audio interviewer and a professor of neurology in the Department of Neurology at the University of California, San Francisco, in San Francisco, California.

Dr. Stahl is an Associate Professor of Clinical Medicine and Sleep Medicine Fellowship Program Director at Indiana University School of Medicine in Indianapolis, Indiana, where she also serves as Sleep Laboratory Medical Director in the Division of Pulmonary, Critical Care, Sleep, and Occupational Medicine.

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Read the article: Obstructive Sleep Apnea

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Host: @AaronLBerkowitz

 Full episode transcript available here

Dr Berkowitz: Obstructive sleep apnea is very common. It can cause or contribute to common neurologic symptoms, such as headache and impaired cognition, and it's a risk factor for stroke. And yet, if you're like me, you may not know too much more about sleep apnea than that. Today, I have the pleasure of talking to sleep expert Dr. Stephanie Stahl to learn what every neurologist should know about OSA. 

Dr Jones:  This is Dr. Lyell Jones, Editor-in-Chief of Continuum. Thank you for listening to Continuum Audio. Be sure to visit the links in the episode notes for information about earning CME, subscribing to the journal, and exclusive access to interviews not featured on the podcast. 

Dr Berkowitz: This is Dr. Aaron Berkowitz. Today I'm interviewing Dr. Stephanie Stahl about her article on obstructive sleep apnea. This article appears in the 2026 Continuum issue on Neurology of Sleep. Welcome to the podcast, Dr. Stahl, and could you please introduce yourself to our audience? 

Dr Stahl: Yeah. Thank you for having me. I'm a sleep medicine physician and neurologist and medical director of the Indianapolis Sleep Lab at Indiana University Health. I serve as the director of the Sleep Medicine Fellowship program. I'm faculty advisor for our very first student interest group in sleep medicine at Indiana University School of Medicine. I'm also actively involved in some national leadership roles, including the incoming chair of the American Academy of Sleep Medicine's Education Committee and co-chair of the Academy's Inter-Scorer Reliability Gold Standard Panel. So, I really appreciate this opportunity. I look forward to our discussion. 

Dr Berkowitz: Me too, and we appreciate the opportunity too to get to talk to you. You have so much expertise in this area, and I certainly encourage our listeners to look at your article, which is very comprehensive and up to date, and I learned a ton from it. I didn't get much exposure to sleep neurology as a trainee, and I've always worked in academic centers where we have a sleep group and we can refer patients there. So, I have to admit, sleep may probably be the area of neurology I know the least about, and felt like I was learning something new from pretty much every line of your article, and I know our readers will too. So, your article has a lot of excellent detail for our readers on the diagnosis and treatment of this very common condition. But I'd like to keep our interview relatively high level today and focus on the essentials for the practicing general neurologist. So, to start, can you just give us a sense of what obstructive sleep apnea is, and what every neurologist should know about it? 

Dr Stahl: Yeah. So obstructive sleep apnea is characterized by either partial or full obstructions in the upper airway. That may sound pretty simple, but this leads to a whole bunch of issues. It leads to oxygen desaturations, arousals from sleep, leading to sleep fragmentation. This can then lead to sympathetic nervous system activation, cerebral hypoperfusion, leading to a whole bunch of symptoms or neurologic conditions. 

Dr Berkowitz: Great. And you mentioned this in your article, but just to emphasize, how common is obstructive sleep apnea in the general population? 

Dr Stahl: Yeah. So, about a quarter of the general population have obstructive sleep apnea. Much more common in many neurologic conditions. 

Dr Berkowitz: Yeah, so very common disorder. We are seeing patients with it quite frequently, whether that's the reason they are seeing us in neurology or not. And this leads to my next question, which is what neurologic symptoms or presenting concerns of a patient should make us think about OSA and the differential diagnosis, and what factors based on the history or the exam or the context would make you suspicious for OSA as the cause of a neurologic symptom? In other words, the patient's presenting with classic symptoms of OSA, and that's why they're seeing a neurologist or seeing a primary care doctor, but is coming for evaluation of, say, headache or other symptoms. And what symptoms would make you think of wanting to consider OSA, and then what aspects of the history or otherwise would make you want to evaluate the patient for OSA? 

Dr Stahl: I think a really important takeaway is for neurologists to know that obstructive sleep apnea is very common in neurologic conditions and has that potential to worsen a lot of these conditions or their associated symptoms. And so, it should be on our radar. There are certainly some basic questions and signs and symptoms that we can ask patients about or, or take a look at on exam. And so particular symptoms include snoring. Anybody that snores loudly or frequently, that's a strong risk factor for obstructive sleep apnea. If someone's seeing them stop breathing in their sleep, if they are waking up a lot throughout the night. There are some other symptoms that we may not necessarily attribute upfront to obstructive sleep apnea, such as nocturia, nocturnal reflux, night sweats. There are some daytime symptoms, of course, too, like unrefreshing sleep, daytime sleepiness, morning headaches, an important one in neurology. And then we take a look at the patient's exam. And so, some things that neurologists might want to be thinking about are people with obesity are certainly at a risk for obstructive sleep apnea. But it's also very important to know that someone does not need to have obesity in order to have obstructive sleep apnea. We look at neck size, other morphologic characteristics, such as how much that we can see in the back of their mouth. Can we see their uvula? Does their tongue size appear large in their mouth? And then some other risk factors too, such as male gender, older age, family history, post-menopausal state in women. All that being said, though, sometimes in neurologic conditions, we don't have all of those symptoms or risk factors to be thinking about. And so, in certain neurologic conditions such as stroke where obstructive sleep apnea is very common and has the potential to increase the risk of another stroke, we may need to be thinking about testing these patients even with minimal symptoms or other risk factors. 

Dr Berkowitz: That's very helpful. So, you mentioned their headache might be the presenting symptom, right, to a neurologist, and we should certainly be thinking about obstructive sleep apnea as a potential diagnosis, even the cause of the patient's headache, particularly you said patients with morning headache. I often try to think about in patients presenting with, for memory loss, or other cognitive concerns, and that may be due more to inattention from poor sleep, so asking about sleep and symptoms of sleep apnea in those contexts. Are there any other presenting neurologic symptoms not particularly related to sleep? I'm thinking of headache, memory loss, other symptoms that would make you think, "Oh, I should actually screen this patient for sleep apnea also." 

Dr Stahl: Yeah, other symptoms to think about in pediatrics, hyperactivity, people that have impaired vigilance, as you alluded to, that poor attention. Sometimes people get misdiagnosed with ADHD, and it's actually just a manifestation of obstructive sleep apnea. 

Dr Berkowitz: You alluded to this, Dr. Stahl, that stroke, for example, patients are at higher risk of developing sleep apnea as a result of stroke, and it's also a risk factor for stroke. What other neurologic conditions, primary neurologic diseases, put patients at a higher risk of OSA? And again, similar to the last question I asked you, what are some clues that we should evaluate for? We might be following a patient for their post-stroke care over time and not necessarily thinking about diagnosing a separate condition in them since we're following them for their stroke or their degenerative disease. What are the conditions that put patients at a higher risk of OSA as a result of the condition, and then when would you think about screening them for it? 

Dr Stahl: Some particular neurologic conditions where obstructive sleep apnea are very common, in addition to stroke and, and TIA, include Parkinson disease. It can worsen a lot of the motor, cognitive symptoms, sleep disruption that we can see in Parkinson disease. Very common in all causes of dementia, but in particular Alzheimer disease and Lewy body dementia. Very common in neuromuscular conditions. We should definitely have obstructive sleep apnea and all forms of sleep-disordered breathing high on our radar. In conditions like myotonic dystrophy. Charcot-Marie-Tooth is another one where obstructive sleep apnea is very common. Myasthenia gravis, it can worsen the symptoms of that. In particular, a pearl is if somebody has morning weakness in myasthenia gravis, obstructive sleep apnea should be high on your radar. And also, as you mentioned, any forms of headaches. There are some other things too. If somebody has poor seizure control, especially nocturnal seizures, you might have obstructive sleep apnea on your radar as well. 

Dr Berkowitz: So, I think you've covered essentially every category of neurologic disease, right? We have cerebrovascular, movement, neurodegenerative, neuromuscular, epilepsy, all conditions where either the disorder itself, such as stroke or the, correct me if I'm wrong, the neurodegenerative disease puts the patient at risk. Or the patient may be at risk for exacerbations of their disease, as you mentioned in myasthenia. I love that pearl. Not fatiguable at the end of the day, but if the patient with myasthenia is telling you they're feeling weaker at the beginning of the day, then think about obstructive sleep apnea and that obstructive sleep apnea worsening control of epilepsy due to poor sleep. So really a lot of bidirectional interactions with this common condition. Okay, so if we're concerned about obstructive sleep apnea, again, myself, a general neurologist speaking perhaps on behalf of other general neurologists, we see a patient with headache or reporting memory loss that we find to be impaired attention, or we see exacerbation of their underlying primary neurologic disease. As you mentioned, we think, "Oh, I've listened to this podcast. I've read Dr. Stahl's article. I should probably be thinking about OSA in this patient, and I should order a sleep study." Now, I admit when I get the sleep study back, I scroll to the bottom, I see they do have obstructive sleep apnea, I'm going to send them over to a sleep specialist. But for the general neurologist, what are some high-yield pearls and some pitfalls to be aware of when we get sleep studies for obstructive sleep apnea, and we are looking at the results?

Dr Stahl: The first thing is to understand that there are two main types of sleep studies: in-lab polysomnography and home sleep apnea test. In-lab studies are typically what we consider the more accurate type of study. Main reason for that is that we have EEG, so we can see if someone is awake versus asleep. Most home sleep apnea tests do not utilize EEG, and so when we're looking at respiratory events, apneas or hypopneas, we're looking at over the total recording time rather than the total sleep time. So, we know we're going to capture some time where a person is awake, where we don't have sleep apnea events, and that can be a big amount of time in people with insomnia, poor sleep efficiency. And as a result of that, it can lead to an underestimation of the apnea-hypopnea index. That's really important for people to understand that that means we can end up with a false negative home sleep apnea test, or it can put them in a category of lower severity than what they actually have. And so, if you get a home sleep study report back that's negative for sleep apnea and you remain concerned, you need to go on to do an in-lab study, where about twenty to fifty percent of people will go on to have a positive in-lab study. You can also get false positives with home sleep apnea tests too, and so ideally, we should only be doing home sleep apnea tests in people that are at high risk of having obstructive sleep apnea to decrease our chance of false positive study. When we get that sleep study report, what's important to take a look at? So the main number that we look at currently is the apnea-hypopnea index. The number of apneas, which are full obstructions in that upper airway, or hypopneas, partial obstructions in the upper airway where either there's an oxygen desaturation or an arousal associated with that. Less than five is considered to be normal. Anything five or more gives them a diagnosis of obstructive sleep apnea, and then we stratify them based on the AHI. But it's important to take a look at more than just the apnea-hypopnea index. And while my eyes too on various reports like echocardiograms want to jump to the impression, it is important to take a look at that full report, see what their oxygen levels averaged and what they dipped down to. The arousal index, which is how many times a patient may have woken up briefly throughout the night. Take a look at the histogram, usually an image at the bottom of their report that shows what sleep fragmentation may have been like so that you can take that all in and make that decision. How important are these study findings, and is this a person that would benefit from treatment? 

Dr Berkowitz: That's a fantastic overview of sleep studies and some of the highlights to look out for, even if we won't be understanding every detail as you would to know most importantly the caveats about home sleep testing having a fairly high percentage of false negative and false positive results. So being wary if our suspicion is high, and that test is normal or inconclusive to get an in-lab sleep study. And if our suspicion is low or maybe we haven't ordered the test and the patient has had it done elsewhere, and the history doesn't really match up to know that there are false positives on the home studies as well, and again, an in-lab study to settle the diagnosis. Is that right? 

Dr Stahl: Yes. 

Dr Berkowitz: Okay. Now, for most neurologists, probably if we diagnose OSA, we will be referring the patient to a sleep specialist like yourself for treatment. I think we're all familiar with CPAP and patients being on CPAP. Your article mentions a number of treatment modalities I admit I have not heard of before or maybe heard of in passing, acknowledging most general neurologists are not going to be prescribing or knowing with the nuance that you do as an expert how to decide which treatment a patient would most benefit from or most qualify for. So, can you just give us a broad overview, again, for the general neurologist acknowledging we might see a patient whose past medical history says OSA being treated with fill in the blank. What are the different treatment modalities, and how do you think, just so we can learn from you in broad brush strokes, about particular treatments for particular patients? 

Dr Stahl: As you mentioned, most people are familiar with positive airway pressure or PAP therapy, and that does remain our most efficacious treatment. The way I explain it to patients is why PAP therapy is the most effective treatment is it's the only treatment that can take all of the tissues of that upper airway and open them up. Whereas all of our other treatments, we're going to target smaller spaces of that upper airway. So, our first option is if we can get somebody on PAP therapy, we know that that's going to be the best option for the majority. PAP therapy works by basically acting as an air splint to open up the air tissues. Know that masks are not interchangeable. There are masks that cover the nose and go over the nose and mouth and under the nose. Full face masks that cover the nose and mouth, they do typically require higher pressures, also tend to be less comfortable for a lot of patients as well. In addition to different PAP masks, there's different modalities of positive airway pressure therapy too. There are machines that auto-adjust, some that provide fixed pressure, bi-level PAP that provides a higher inspiratory pressure, lower expiratory pressure. Then outside of PAP therapy, there are, as you alluded to, a lot of options and more, continuing to come down the pipeline as well. Mandibular advancement devices or a form of oral appliances has been around for a while. This is device that somebody wears in their mouth. It's preferably customized for their teeth and titratable, meaning that they can make adjustments that pulls their mandible forward in relation to the maxilla in order to pull those tongue tissues further away from the back of the upper airway. That's ideally managed by a qualified sleep dentist or someone that specializes in oral appliance management. Other treatments include surgical options, including hypoglossal nerve stimulation, which is an implanted device that causes the tongue to protrude repetitively throughout their sleep period to hopefully open up the airspace. There's some other surgical options too that open up various places of the upper airway. There's a daytime treatment of obstructive sleep apnea, transoral neuromuscular electrical stimulation that changes the muscle fiber type of the tongue. And then there's some adjunctive treatments that can be helpful too, such as positional therapy, oral facial myofunctional therapy that helps a person breathe better through their nose and may help train the upper airway muscles. 

Dr Berkowitz: Great. Well, that's a very helpful overview, and again, I refer our listeners to your article, which talks about all of those modalities in very comprehensive detail. So, Dr. Stahl, as we wrap up our conversation, you have a captive audience of neurologists and neurology trainees here. What would you like to leave us with that every neurologist should know about obstructive sleep apnea? 

Dr Stahl: The most important, again, is for neurologists to know that obstructive sleep apnea is so common in your patient population, and it can have a significant negative impact on quality of life and health, including many neurologic conditions. And at the same time, obstructive sleep apnea is very treatable. We have so many options nowadays that we can usually get someone onto adequate treatment. And treatment has that potential to improve several neurologic symptoms and disorders, even at times when you don't think that there's an opportunity to improve symptoms such as say in, headache. So, neurologists really should be screening for signs and symptoms of obstructive sleep apnea, as well as considering testing in high-risk, potentially asymptomatic or minimally symptomatic patients. 

Dr Berkowitz: That's a fantastic overview of some of the many pearls that you shared with us today, as well as in your article. So, thank you so much again. Today, I've been interviewing Dr. Stephanie Stahl about her article on obstructive sleep apnea. This article appears in the August 2026 Continuum issue on neurology of sleep. Be sure to check out Continuum Audio episodes from this and other issues. And thank you so much to our listeners for joining today, and thank you again, Dr. Stahl. 

Dr Stahl: Thank you again for having me. 

Dr Monteith: This is Dr. Teshamae Monteith, Associate Editor of Continuum Audio. If you've enjoyed this episode, you'll love the journal, which is full of in-depth and clinically relevant information important for neurology practitioners. Use the link in the episode notes to learn more and subscribe. AAN members, you can get CME for listening to this interview by completing the evaluation at continpub.com/audioCME. Thank you for listening to Continuum Audio.