Dan Keller 0:02 Welcome to this episode of Substantial Matters: Life and Science of Parkinson's. I'm your host, Dan Keller, at the Parkinson's Foundation. We want all people with Parkinson's and their families to get the care and support they need. Better care starts with better research and leads to better lives. In this podcast series, we highlight the fruits of that research—the treatments and techniques that can help you live a better life now, as well as research that can bring a better tomorrow.
Restorative sleep is essential for optimal physical, mental, and emotional functioning, but sleep problems are remarkably common among people with Parkinson's disease, affecting up to 90% according to today's guest, sleep specialist Dr. Aleksandar Videnovic of Massachusetts General Hospital. These problems are some of the most troubling in terms of non-motor symptoms and can seriously affect overall quality of life. Many factors can interfere with sleep, including anti-Parkinson's medications and the disease pathology itself; for example, severe tremors or the frequent nocturnal need to use the bathroom may awaken people, while pain and the physical inability to easily turn over in bed can cause profound discomfort.
Dr. Videnovic says that among the many sleep disturbances, insomnia, excessive daytime sleepiness, and REM sleep behavior disorder are among the most common. REM stands for rapid eye movement, those specific parts of the sleep cycle in which one's eyes move rapidly under the eyelids but do not send any actual visual information to the brain. This is the phase of sleep in which vivid dreams usually occur, but the body's muscles are normally paralyzed so that the person does not physically act out those dreams. When we spoke, he set the stage by describing the magnitude of this challenge.
Dr. Aleksandar Videnovic 2:10 Disorders of sleep and alertness are extraordinarily common in the Parkinson's disease population. I would say that, based on my clinical experience and corroborated by the scientific literature written on this topic, almost every patient with Parkinson's disease will, at some point throughout the course of their disease, experience one or another type of sleep disturbance. Therefore, this represents a very common and frequently challenging non-motor manifestation associated with Parkinson's.
Dan Keller 2:45 It is a very basic question, but why is sleep so fundamentally important, and what exactly happens to the body and brain if there are chronic sleep disturbances?
Dr. Aleksandar Videnovic 2:53 Well, obviously, we spend almost one-third of our lives sleeping, so it has to possess vast evolutionary significance, right? From an evolutionary perspective, sleep as a core bodily function has been incredibly well preserved across species; all animals need to sleep, and humans need to sleep as well. Simply put, you cannot survive without sleep. Therefore, from this really broad perspective, sleep is mandatory for basic survival and for optimal daytime human performance.
In Parkinson's disease specifically, sleep is particularly important as we understand the profound neurological benefit of a good night of rest. This is something well-recognized in our field as the "sleep benefit" that patients with Parkinson's report. After having a solid, consolidated night of sleep, patients notice that their Parkinson's motor symptoms are much easier to manage the following day. A lot of patients will even report that their clinical responsiveness to their dopaminergic medications the next day is substantially better if they had high-quality sleep the night before. So, while sleep is relevant for everyone, it carries a very particular significance and an essential therapeutic place in the lives of patients who suffer from Parkinson's disease.
Dan Keller 4:11 What are some of the most common types of sleep disturbances that people experience with PD?
Dr. Aleksandar Videnovic 4:17 When we discuss disturbed sleep in Parkinson's disease, I like to separate these clinical issues into two large, distinct categories. One comprises the difficulties that emerge during the nighttime—meaning primary nighttime sleep disruptions—and the other comprises disturbances that manifest during the daytime, specifically excessive daytime sleepiness. These daytime symptoms may or may not be directly linked to the specific disruptions occurring during the night. Those are the two very broad categories of disruptions within the sleep-wake cycle in Parkinson's.
Dan Keller 4:49 What are some of the long-term outcomes of these disruptions? For instance, are there cognitive or behavioral effects during the daytime if a patient's sleep is chronically disturbed at night?
Dr. Aleksandar Videnovic 4:59 Yes, disturbed sleep at night has a multitude of negative consequences the following day. Obviously, if someone does not sleep well, that individual feels sleepy, fatigued, and exhausted the next day. They are often unable to concentrate, focus, or function well in a mental capacity. As I mentioned, a good night of sleep can have direct, positive effects on the motor function that patients exhibit the next day, and conversely, after a poor night of sleep, a patient's motor symptoms can worsen. Furthermore, our mood is significantly degraded following poor sleep. Patients with Parkinson's disease frequently struggle with mood disorders, such as depression or anxiety, to begin with, and poor sleep severely aggravates those neuropsychiatric symptoms.
Dan Keller 5:43 One sleep disturbance that seems to emerge remarkably early—even long before people are officially diagnosed with PD—is REM sleep behavior disorder, or RBD. How early can that happen, and does it typically persist once people are diagnosed with Parkinson's?
Dr. Aleksandar Videnovic 5:59 REM sleep behavior disorder is a primary sleep pathology that belongs to a group of sleep disorders known as parasomnias, which is simply a clinical term for various abnormal behaviors or movements that can occur during sleep. In this particular condition, the disturbance emanates directly from the REM stage of sleep. Normally during REM sleep, our brain blocks muscle activity, causing temporary paralysis so we don't move. In RBD, that muscle paralysis is lost, causing patients with Parkinson's—or even otherwise healthy individuals who do not yet have Parkinson's—to physically act out their dreams.
In summary, it has been robustly recognized that individuals who present with isolated REM sleep behavior disorder are at a substantially increased risk of developing Parkinson's disease or related alpha-synuclein neurodegenerative disorders later in life. This sleep disorder can precede the onset of classic Parkinson's motor symptoms by years, or even decades, and it certainly remains present throughout the course of the disease as well. Therefore, identifying RBD is clinically vital because it serves as an early prodromal marker indicating that the underlying neurodegenerative process may have already started in the brain. It is often just a matter of time before the cardinal motor symptoms of Parkinson's disease emerge and a formal clinical diagnosis can be established.
Dan Keller 7:35 It sounds like people struggle with sleep disturbances quite a bit in Parkinson's disease, which drastically impacts their function and quality of life. But do you find that patients actually bring these issues to the attention of their neurologists enough during routine appointments?
Dr. Aleksandar Videnovic 7:50 I would say that disturbances of sleep and alertness are heavily underreported overall by our patients. At the same time, they are also frequently underrecognized by physicians and other healthcare professionals. It is therefore critical that healthcare providers, patients, care partners, and family members all understand that paying significant attention to the quality of sleep can have massive therapeutic rewards and heavily lessen the overall burden of Parkinson's disease. We must all educate ourselves to pay closer attention to it.
Dan Keller 8:31 Given that there are quite a number of distinct reasons for poor sleep, can you categorize some of the modern medical and behavioral treatments that are currently available?
Dr. Aleksandar Videnovic 8:43 Because there are so many different root causes for disturbed sleep at night, selecting an appropriate intervention is entirely dependent on establishing an accurate, specific diagnosis of the underlying sleep problem. Each distinct sleep disturbance will have its own tailored subset of treatments.
That being said, the absolute starting point for improving and treating any sleep disorder in Parkinson's disease is to understand the core principles of good sleep hygiene and apply those principles rigorously to our daily routines to maximize the biological chance for consolidated sleep. Beyond establishing healthy sleep hygiene habits, there are specific, tailored treatment approaches. These span from targeted cognitive behavioral therapy for insomnia (CBT-I) to optimize sleep-wake cycles, to the utilization of Continuous Positive Airway Pressure (CPAP) therapy for patients diagnosed with obstructive sleep apnea, to a variety of pharmacological interventions. Medications can be carefully prescribed to manage specific refractory issues like chronic insomnia, severe REM sleep behavior disorder, or restless legs syndrome.
Dan Keller 10:11 Is it only the total duration of sleep that matters? How do you clinically evaluate the quality of a patient's sleep to know if they are truly getting restorative rest?
Dr. Aleksandar Videnovic 10:19 What matters most when we analyze sleep metrics is a combination of both quantity and quality. This is an excellent question because, certainly, we want patients to have enough total sleep, but we also require high-quality sleep architecture.
It is important to emphasize that total time spent in bed does not equate to true sleep duration. Frequently, especially among Parkinson's disease patients, an individual might spend up to 10 hours resting in bed, but a large portion of that time is actually spent tossing, turning, and being awake in a state of sleep fragmentation. In general, large epidemiological studies investigating optimal sleep duration suggest that we should aim for anywhere between six and nine hours of sleep per night; getting consistently less than six hours or routinely more than nine hours is generally associated with poor health outcomes.
At the same time, we want that sleep to be consolidated and uninterrupted. It is much easier to quantify the exact duration of sleep than it is to perfectly define what "good quality" sleep means. Clinically, we look for uninterrupted sleep that allows the patient to wake up feeling genuinely refreshed, indicating they have achieved sufficient deep slow-wave sleep and REM sleep, which are critical for memory consolidation, neurological repair, and overall well-being. Both quantity and quality are absolutely essential.
Dan Keller 11:46 You mentioned earlier that in REM sleep behavior disorder, people physically act out their dreams. Does this action inherently disrupt their own sleep, do they realize they are doing it, and how does it typically impact the bed partner?
Dr. Aleksandar Videnovic 11:59 REM sleep behavior disorder absolutely disrupts the sleep of the individual experiencing it, but it frequently takes an even greater toll on their bed partner. In addition to degrading overall sleep architecture, RBD poses severe physical safety challenges. Because these dreams are often vivid, intense, or violent, acting them out exposes both the patient and their bed partner to a high risk of physical injury.
For example, I have had a number of patients report that during a vivid dream, they end up violently lurching out of bed and falling hard onto the floor. Alternatively, if they are dreaming that they are being threatened and need to defend themselves, they may start kicking, punching, or fighting with their bed partner. The bed partner is then suddenly awakened in the middle of the night by a physical assault and can be substantially hurt. RBD severely compromises the sleep quality of both individuals and introduces an acute risk of trauma due to these dream enactment behaviors.
Dan Keller 13:10 What is your professional take on daytime naps? Are they generally good, bad, or does it depend on how they are utilized?
Dr. Aleksandar Videnovic 13:16 Napping is a very interesting concept when we discuss overall sleep health. I believe that naps, when employed appropriately, can be highly beneficial to our patients with Parkinson's disease.
What do I mean by employing them appropriately? In general, whether an individual has Parkinson's or not, we want to avoid prolonged daytime naps. We want to avoid naps that last an hour, two hours, or longer, because accumulating that much sleep debt reduction during the day directly destroys our sleep drive and interferes with our ability to fall and stay asleep at night. We also want to strictly avoid napping late in the afternoon or evening, close to our primary bedtime, for the same reason. However, if a patient takes a short, structured nap of about 30 to 40 minutes in the middle of the day—specifically when our internal biological alerting signal experiences its natural circadian dip after lunch, typically between 1:00 PM and 3:00 PM—these naps can be incredibly refreshing and restorative. I frequently advocate for and advise patients to take a brief midday nap if their schedules permit, as long as it remains strictly time-limited.
Dan Keller 14:39 Looking to the future, where is the field going, and what are some of the most exciting research directions right now?
Dr. Aleksandar Videnovic 14:43 There are a lot of exciting research directions underway regarding sleep and wakefulness in Parkinson's. We are actively trying to develop novel therapeutics, which include both innovative pharmacological agents and advanced non-pharmacological methods. For example, the utilization of photomodulation and light therapy to optimize circadian rhythms is a major non-pharmacological focus. Our research group conducts a great deal of work in this specific area, alongside other teams globally.
Research is also progressing toward a deeper understanding of the underlying pathophysiology and the specific brain mechanisms driving sleep impairment in Parkinson's. A novel and highly exciting avenue is our expanding understanding of how the circadian system—our internal biological timing mechanism—becomes impaired by the disease. We all have internal master clocks situated deep within the brain, in the suprachiasmatic nucleus, and our investigations have demonstrated that there is clear structural dysfunction of that internal clock in Parkinson's; the clock is simply not ticking as it should. We are exploring this further to design targeted chronotherapeutic interventions based on those findings.
Finally, there is an immense amount of clinical research focusing on REM sleep behavior disorder. Because RBD serves as a reliable prodromal marker that precedes the motor onset of Parkinson's, it offers a crucial window for neuroprotective trials. Once we validate reliable disease-modifying agents that can halt the progression of neurodegeneration, it will be plausible to deploy these therapies early in individuals who present with isolated RBD before they ever develop the motor signs of Parkinson's. This allows us to maximize our chance of clinical success by arresting the neurodegenerative process earlier, before it has taken a more substantial, irreversible toll on critical brain cells. I believe that is one of the most revolutionary areas of research in the entire field.
Dan Keller 17:02 It is fascinating that you bring that up. We previously hosted a podcast episode with Dr. Robert Hauser discussing the "golden year" of Parkinson's—that crucial early window before a patient ever starts dopaminergic medication—focused on identifying disease-modifying therapies that can slow down clinical progression. It sounds like REM sleep behavior disorder might serve as a cardinal, pre-diagnostic sign that someone is entering that exact neurodegenerative path, even before they meet the official motor criteria for a diagnosis.
Dr. Aleksandar Videnovic 17:29 Absolutely, that is precisely why the systematic, rigorous study of REM sleep behavior disorder is so critical. It allows us to accurately identify individuals who are at an ultra-high risk of developing Parkinson's disease during the earliest stages of neurodegeneration. If we can apply targeted neuroprotective interventions at that prodromal phase, we can be vastly more successful in arresting the underlying disease process compared to waiting until the degeneration has advanced to the point where classic motor signs—such as resting tremors, bradykinesia, and rigidity—finally emerge. Our biological window to stop the disease from progressing is much wider during these early sleep-manifested stages than it is later on.
Dan Keller 18:16 And finally, Aleksandar, do you have a definitive take-home message in a nutshell for people living with Parkinson's or their care partners who suspect they are dealing with a sleep disturbance?
Dr. Aleksandar Videnovic 18:27 My primary take-home message is that we should all pause and proactively analyze our sleep. We need to take the time to ask ourselves: Is my sleep truly okay? Am I getting enough hours of rest? We must also ask our bed partners how we sleep, because we are inherently unaware of our own nocturnal movements, vocalizations, or behaviors while we are unconscious.
If you identify any issues, pay significant attention to them and take the time to discuss them openly with your Parkinson's clinician, or seek a formal evaluation from a specialist in sleep medicine. It is an absolute certainty that by improving your nighttime sleep quality and your daytime alertness, you will drastically improve your overall quality of life and daily functioning. Parkinson's disease symptoms become significantly less burdensome when backed by a good night of consolidated sleep. Sleep truly is an essential pillar of health; we frequently take it for granted, but we shouldn't, because a lot can go wrong during the night without us consciously recognizing it. Let's look at how we sleep, optimize this vital function that nature has granted us, and use it to live the best lives possible.
Dan Keller 19:45 Tremendous advice. Thank you, Dr. Videnovic, for sharing your expertise and providing such helpful, actionable information on a problem that impacts so many.
Because sleep disorders are incredibly prevalent in Parkinson's disease, our website at parkinson.org offers extensive, evidence-based information and resources on the subject. Simply search for "sleep" to find educational fact sheets and guides covering both behavioral modifications and medical approaches to achieving better rest.
Those specific, evidence-based behaviors that one can adopt to promote consolidated rest are known as sleep hygiene. If you search for that term in our digital library at parkinson.org/library, you will find an excellent, practical guide titled Tips for a Good Night's Sleep: Sleep Hygiene. Additionally, our dedicated "Sleep Disorders" portal features comprehensive tips for behavior changes you can implement during the daytime, alongside targeted adjustments for your nighttime environment.
Our digital archive holds many other valuable resources on sleep. A fantastic starting point is our educational book titled Sleep: A Mind Guide to Parkinson's Disease, which is available for online reading, print ordering, or direct download to your Kindle device. For our Spanish-speaking community, the library features tailored multimedia content, including an educational video and written booklet titled Descanso y Sueño.
You can also watch the full expert briefing that Dr. Videnovic presented for the foundation, titled Sleep and Parkinson's. Furthermore, we provide a specialized clinical fact sheet covering medications for non-motor symptoms, which features dedicated sections detailing pharmacological options for treating excessive daytime sleepiness and primary sleep disorders.
In closing, remember two critical takeaways: first, engaging in regular, structured exercise has been proven to significantly improve overall sleep quality; second, always report any sleep disruptions to your movement disorders physician or healthcare provider. If you do not actively bring it up, they may not know to ask, and reporting it is the only way to secure the specialized help you deserve.
As always, if you need immediate, personalized assistance, the Parkinson's Foundation Helpline is here for you. Our bilingual information specialists can answer your questions in English or Spanish regarding sleep modifications, exercise, or any other facet of Parkinson's care. You can reach them toll-free at 1-800-4PD-INFO. To ensure you never miss future educational webinars, local community resources, or research updates, you can join our email registry at the bottom of our homepage.
If you would like to leave feedback regarding this episode or suggest future topics, please visit parkinson.org/feedback. If you found this podcast valuable, please take a moment to subscribe, rate, and review Substantial Matters on Apple Podcasts or your preferred streaming platform.
At the Parkinson's Foundation, our mission is to help every person diagnosed with Parkinson's live the best possible life today. To that end, we will be back with a brand-new episode every two weeks. Until next time, for additional information and expert resources, please visit parkinson.org or call our helpline at 1-800-4PD-INFO, which is 1-800-473-4636. Thank you for listening.