Gina Johnson
REM Sleep Behavior Disorder (RBD) is a chronic sleep condition characterized by dream enactment and loss of REM atonia. People with RBD act out their dreams physically and/or vocally during the rapid eye movement (REM) stage of sleep, often violently, and are at risk of injuring themselves or their bed partners. RBD is a parasomnia, a sleep disorder that involves unusual and undesirable physical events or experiences that disrupt sleep. It is most common in people over 50, with an average age of onset at 61, and is strongly associated with certain neurodegenerative disorders.
| Characteristics | Values |
|---|---|
| Definition | REM sleep behavior disorder (RBD) is a parasomnia, a sleep disorder that involves unusual and undesirable physical events or experiences that disrupt your sleep. |
| Cause | The underlying cause of RBD is not well understood, but it is likely an early symptom of synucleinopathy rather than a separate disorder. |
| Symptoms | People with RBD physically and/or vocally act out their dreams while in the rapid eye movement (REM) stage of sleep. They are unaware of their actions while asleep. |
| Age | RBD most commonly affects people over the age of 50. The average age of onset is 61 years. |
| Gender | Among people over age 50, men are nine times more likely than women to have RBD. |
| Prevalence | RBD is relatively rare, affecting about 1% of the general US population. |
| Diagnosis | The gold standard protocol for RBD diagnosis is a clinical assessment conducted by a clinician. This may include a detailed history, brain MRI, and the REM Sleep Behavior Disorder Screening Questionnaire (RBDSQ). |
| Treatment | Treatment options include melatonin, clonazepam, and the melatonin receptor agonist Ramelteon. |
| Associated Disorders | RBD is strongly associated with neurodegenerative disorders such as Parkinson's disease, Lewy body dementia, multiple system atrophy, narcolepsy, Guillain-Barré syndrome, limbic encephalitis, and Morvan's syndrome. |
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What You'll Learn
RBD is a parasomnia
REM Sleep Behaviour Disorder (RBD) is a parasomnia, a sleep disorder that involves undesirable physical events or experiences that disrupt sleep. It is characterised by dream enactment and loss of REM atonia. People with RBD act out their dreams, often violently, while in the REM stage of sleep. They are vocal and physically active, unaware of their actions and may injure themselves or their bed partner.
RBD is a chronic condition that can develop spontaneously without an underlying cause, this is known as isolated or idiopathic RBD. It is also associated with certain neurodegenerative disorders, specifically Parkinson's disease, Lewy body dementia, or multiple system atrophy (MSA). Most people with idiopathic RBD will eventually develop one of these conditions. The average age of onset for RBD is 61 years, and it is nine times more common in men than women over 50.
Symptomatic or secondary RBD is caused by underlying conditions such as Type 1 narcolepsy or the use of certain antidepressants. When RBD occurs alongside an alpha-synucleinopathy, it is considered secondary RBD. RBD patients have a high risk of developing neurodegenerative diseases, with over 70% developing parkinsonism or dementia within 12 years of diagnosis.
The symptoms of RBD can vary in severity, ranging from mild muscle twitches to more violent episodes that result in sleep-related injuries. Episodes may occur once or multiple times during a sleeping period. As RBD can be difficult to diagnose, almost half of those with the condition may be unaware that they have it. Due to the risk of injury, it is important to seek treatment and create a safe sleeping environment.
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RBD diagnosis and treatment
REM sleep behaviour disorder (RBD) is a parasomnia, a sleep disorder that involves undesirable physical experiences or actions that disrupt sleep. People with RBD act out their dreams, often violently, while in the rapid eye movement (REM) stage of sleep. They are unaware of their actions, which can cause injury to themselves or their bed partner.
RBD diagnosis can be challenging due to its low prevalence and limited awareness among medical professionals. The gold standard for diagnosis is a clinical assessment that includes a detailed history and a sleep study. Clinicians should gather information from bed partners, as they can provide valuable insights into sleep-related behaviours. Further investigations, such as brain MRI, may be required to diagnose secondary RBD and inform treatment. Polysomnography, a type of sleep study with video recording, is also used to confirm abnormal behaviours during REM sleep and exclude other sleep disorders.
There is currently no ideal treatment for RBD. The first-line therapy drugs are typically clonazepam and melatonin, but their effectiveness has not been proven in randomized clinical trials. Melatonin, for example, has shown some improvement in self-reported measures such as sleep quality and dream enactment behaviours, but it may be less effective in controlling RBD symptoms in advanced neurodegeneration. Other treatments, such as rivastigmine, memantine, 5-hydroxytryptophan, and the herbal medicine yokukansan, have shown some efficacy in short- and medium-term trials involving a small number of patients. Treating comorbid sleep disorders, such as obstructive sleep apnea, may also help reduce the frequency and severity of RBD symptoms.
The aim of RBD treatment is to prevent sleep-related injuries and improve sleep quality. As RBD is strongly associated with neurodegenerative disorders, early diagnosis and management are crucial to slow disease progression and improve patient outcomes.
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RBD and injuries
REM sleep behaviour disorder (RBD) is a sleep disorder characterised by the loss of normal skeletal muscle atonia during REM sleep. This results in individuals physically acting out their dreams, often violently, while remaining unaware of their actions. The violent nature of RBD episodes can lead to accidental injuries to oneself or one's bed partner. About 8 in 10 people with RBD experience sleep-related injuries.
The risk of injury during RBD episodes can be mitigated by taking certain precautions. Firstly, it is important to secure the sleeper's environment by removing any potentially dangerous objects, such as furniture and sharp objects, from the bedroom. This may also involve moving the bed away from the window and placing cushions around it or moving the mattress to the floor. In extreme cases, individuals with RBD have slept in sleeping bags zipped up to their necks, wearing mittens to prevent them from removing the sleeping bag during sleep. Additionally, bed partners are advised to sleep in a separate room or bed until the RBD symptoms are under control.
If safety measures alone are insufficient to prevent injuries, medication can be prescribed to manage RBD symptoms. Melatonin, a hormone that the body naturally produces to regulate the sleep cycle, is considered the first-line medication for treating RBD due to its low side-effect profile. Other medications that have been used to treat RBD include clonazepam, pramipexole, and ramelteon. However, it is important to note that there are currently no U.S. Food and Drug Administration (FDA)-approved medications specifically for RBD.
While RBD itself can cause injuries, it is also associated with an increased risk of developing neurodegenerative disorders, particularly Parkinson's disease, Lewy body dementia, and multiple system atrophy. These disorders can further exacerbate the severity of RBD symptoms, increasing the risk of injury. Therefore, it is crucial to seek treatment for RBD and closely monitor individuals with the disorder for the development of these neurological conditions.
In summary, RBD is a sleep disorder that can lead to injuries due to violent dream enactment behaviours. The risk of injury can be reduced through environmental modifications and medication. Additionally, the association between RBD and neurodegenerative disorders underscores the importance of seeking treatment and regular follow-up evaluations for individuals with RBD.
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RBD and neurodegenerative disorders
REM Sleep Behavior Disorder (RBD) is a chronic sleep condition characterised by dream enactment and loss of REM atonia. During an episode, a person with RBD may experience mild muscle twitches or limb movements, talk, shout, or scream, kick, punch, or grab the air or their bed partner, or jump or fall out of bed. RBD can cause injury to the person with the disorder or their bed partner, especially if they are acting out a violent nightmare.
RBD is strongly associated with certain neurodegenerative disorders. About 97% of people who have isolated (idiopathic) RBD will develop Parkinson's disease, Lewy body dementia, or multiple system atrophy (MSA) within 14 years of diagnosis. RBD patients have a high risk of developing one of the neurodegenerative α-synucleinopathy diseases: over 70% will develop parkinsonism or dementia within 12 years of their diagnosis. RBD patients also exhibit accelerated disease progression and a more severe phenotype than α-synucleinopathy sufferers without RBD.
The prognosis for RBD depends largely upon the subtype. Patients diagnosed with RBD secondary to medication have the most promising prognosis of RBD resolution once the causative medication is withdrawn. However, it has been shown that RBD may persist following the cessation of SSRIs, and it is therefore possible that in some cases, the medication simply "unmasked" an already underlying pathology, triggering early clinical presentation. For RBD secondary to a defined lesion, the main symptoms of RBD can be controlled relatively reliably using a combination of pharmacological and behavioural treatments. For patients with RBD presenting as part of a clinically defined neurodegenerative condition, the management of their sleep disorder should form part of their holistic care.
The gold standard protocol for RBD diagnosis is a clinical assessment. However, the practice of relying solely on clinical assessment or screening questionnaires is likely to result in a significant number of false-positive diagnoses. Individuals suspected of having RBD should be referred to a specialist Sleep Medicine or Neurology service for a diagnostic assessment. This initial outpatient clinical assessment broadly consists of a general examination and neurological examination to rule out differential diagnoses, coupled with several tests and rating scales designed to assess more specific sleep and neurodegenerative aspects of the condition.
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RBD and drug interactions
REM Sleep Behavior Disorder (RBD) is a chronic sleep condition characterised by dream enactment and loss of REM atonia. People with RBD act out their dreams physically and vocally while in the rapid eye movement (REM) stage of sleep, and are unaware of their actions. RBD can lead to accidental injury to oneself or one's bed partner, especially if violent nightmares are being acted out.
RBD is a parasomnia, a sleep disorder that involves undesirable physical experiences that disrupt sleep. There are two main types of RBD: isolated (idiopathic) and symptomatic (secondary). Isolated RBD occurs spontaneously without an underlying cause, while symptomatic RBD is associated with certain neurodegenerative disorders. About 97% of people with isolated RBD will develop Parkinson's disease, Lewy body dementia, or multiple system atrophy within 14 years of diagnosis. Up to 36% of people with Type 1 narcolepsy have symptomatic RBD, and about 6% of people who take antidepressants have drug-induced RBD.
Drug-induced RBD is a recognised phenomenon, and certain drugs may also interact with treatments for RBD. Melatonin, for example, has been found to improve self-reported measures such as daytime sleepiness, sleep quality, and dream enactment behaviours. However, it has also been found to have no effect on RBD symptom frequency or severity in patients with Parkinson's disease. Melatonin may be more suitable for RBD patients than clonazepam because it causes fewer side effects, has a low-risk tolerance, and has few drug interactions. Nevertheless, the uncertainty around melatonin's mechanism of action and overall efficacy means that clonazepam is often preferred.
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Frequently asked questions
RBD stands for Rapid Eye Movement Sleep Behavior Disorder. It is a chronic sleep condition characterized by dream enactment and loss of REM atonia.
People with RBD may experience mild muscle twitches, limb movements, shouting, screaming, jumping or falling out of bed, and punching or kicking their bed partner. They may also recall the dream they were having when awakened.
Treatment for RBD involves an in-laboratory sleep study (polysomnography) with video recording to confirm abnormal behaviors during REM sleep and rule out other sleep disorders. Melatonin has been found to improve self-reported measures such as daytime sleepiness, sleep quality, and dream enactment behaviors.
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