Have you ever been told that you talk, yell, punch, kick, or move around in your sleep? While occasional movement during sleep is normal, acting out vivid dreams may be a sign of a condition called REM behavior disorder.
REM behavior disorder, also known as REM sleep behavior disorder or RBD, is a sleep disorder in which a person physically or verbally acts out their dreams during a stage of sleep when the body would normally remain still. Symptoms can range from talking or small movements to more intense behaviors like punching, kicking, or jumping out of bed.
Because REM behavior disorder can sometimes be confused with other sleep conditions, understanding the symptoms and causes can help you know when it may be time to talk with a healthcare provider.
What Is REM Behavior Disorder?
REM behavior disorder occurs during rapid eye movement, or REM, sleep. This is the stage when vivid dreaming most commonly occurs.
During normal REM Sleep, the brain sends signals that temporarily reduce muscle activity. This process, known as REM sleep atonia, helps keep the body from physically acting out dreams.
In people with REM behavior disorder, this natural muscle paralysis does not occur as it normally should. As a result, the person may physically respond to what is happening in their dreams. The behaviors may be mild in some people and more intense in others. Episodes can also become more frequent or disruptive over time.
What Does REM Behavior Disorder Look Like?
One of the most noticeable characteristics of REM behavior disorder is that the person’s movement often appears connected to their dreams.
For example, someone may dream that they are being chased and physically move their legs if they are running. Another person may dream that they are defending themselves and respond by punching or yelling.
A bed partner is often the first person to notice these behaviors. The person experiencing them may not be aware that they are moving or making noises during sleep. However, they may remember vivid or frightening dreams when they wake up.
These episodes are typically more common during the second half of the night when periods of REM sleep become longer.
Not every person who talks or moves during sleep has REM behavior disorder. Other sleep conditions can cause unusual nighttime behaviors, which is why professional evaluation may be needed to determine that cause.
Common Symptoms of REM Behavior Disorder
Symptoms of REM behavior disorder can vary from person to person. Common signs may include:
- Physically acting out dreams
- Vivid or intense dreams
- Talking, yelling, or shouting during sleep
- Punching, kicking, or flailing the arms
- Sitting up or jumping out of bed
- Falling out of bed
- Injuries to yourself or a bed partner
- Remembering vivid dreams after waking
Some people experience occasional episodes, while others have symptoms more regularly. If nighttime movements are frequent, becoming more intense, or creating a risk of injury, it is important to discuss them with a healthcare provider.
What Causes REM Behavior Disorder?
The exact cause of REM behavior disorder is not always known. In some cases, it occurs without an identifiable cause. In others, it may be associated with certain medications, neurological conditions, or other health factors.
REM behavior disorder has been associated with several neurological conditions, including Parkinson’s disease and other disorders involving the nervous system. However, having REM behavior disorder does not mean that someone will necessarily develop one of these conditions.
Certain medications may also be associated with REM behavior disorder or changes in sleep behaviors. Because there can be several possible causes, a healthcare provider can help determine whether additional evaluation is appropriate.
Who Is Most at Risk for REM Behavior Disorder?
REM behavior disorder can affect anyone, but it is more commonly diagnosed in older adults and is more frequently seen in men. People with certain neurological conditions may also have an increased risk. Some medications may be associated with the development of symptoms as well.
However, unusual nighttime behaviors can have many different causes. Age or other risk factors alone are not enough to determine whether someone has REM behavior disorder. A healthcare provider or sleep specialist can help evaluate symptoms and determine whether further testing is needed.
Can REM Behavior Disorder Be Dangerous?
One of the biggest concerns with REM behavior disorder is the potential for injury. Because a person may physically act out their dreams, they may accidentally hurt themselves or their bed partner. Depending on the intensity of the movements, this could result in:
- Falling out of bed
- Bruises or other injuries
- Hitting or kicking a bed partner
- Disrupted sleep for both people
- Fear or anxiety about going to sleep
If someone is experiencing frequent or forceful movements during sleep, it may be helpful to make the sleep environment safer. This could include removing sharp or fragile objects around the bed, moving furniture away from the sleeping area, or creating more distance between sleeping partners when appropriate.
How is REM Behavior Disorder Diagnosed?
If REM behavior is suspected, a healthcare provider will typically begin by reviewing the person’s symptoms, medical history, medications, and sleep patterns. A bed partner’s observations can also be helpful because the person experiencing the episodes may not remember them.
In some cases, an overnight sleep study called a polysomnogram may be recommended. This type of testing allows specialists to monitor different aspects of sleep, including:
- Brain activity
- Eye movements
- Muscle activity
- Heart rate
- Breathing
- Oxygen levels
- Body movements
Monitoring these factors can help determine what is happening during sleep or whether symptoms may be related to REM behavior disorder or another condition.
REM Behavior Disorder vs. Other Sleep Conditions
Acting out dreams is not the only reason someone may move, talk, or behave unusually during sleep. Other conditions can cause nightmares movements or vocalizations, including:
- Sleepwalking
- Night terrors
- Sleep-related seizures
- Obstructive sleep apnea
- Periodic limb movements
- Medication-related sleep behaviors
The timing of symptoms and the stage of sleep in which they occur can help healthcare providers determine the possible cause. Because these conditions can sometimes look similar, an accurate evaluation is important before assuming that nighttime behaviors are caused by REM behavior disorder.
What Happens After a Diagnosis?
Treatment and management for REM behavior disorders depend on the individual’s symptoms and overall health. A healthcare provider may recommend steps to reduce the risk of injury during sleep, review medications that could be contributing to symptoms, or evaluate for underlying medical or neurological conditions.
In some cases, medications may be prescribed to help reduce nighttime behaviors. Because REM behavior disorder can sometimes be associated with other health conditions, ongoing medical follow-up may also be recommended. The appropriate next steps depend on the individual and their specific symptoms.
Understanding Unusual Sleep Behaviors
REM behavior disorder is a relatively uncommon sleep condition, but recognizing the signs can help people know when nighttime behaviors may require further attention.
If you or someone you love is experiencing unusual sleep behaviors, start by talking with a healthcare provider. They can help determine whether the symptoms may be related to REM behavior disorder, another sleep disorder, medication, or an underlying health condition.
At Sleep Wellness Center, we believe that understanding your sleep is an important part of understanding your overall health. Learning more about sleep disorders and recognizing changes in your sleep patterns can help you have more informed conversations with your healthcare provider.
If you have concerns about your sleep or nighttime behaviors, don’t ignore them. Paying attention to what happens while you sleep can be an important first step toward getting the answers you need.
