Miya Pearson
Involuntary leg twitching during sleep, known as hypnic jerks or sleep myoclonus, is a common phenomenon that can occur as people transition from wakefulness to sleep. These sudden muscle contractions can feel like a jolt or falling sensation and may be accompanied by a dream or a startled feeling. While hypnic jerks are generally harmless, widespread or persistent twitching can indicate an underlying health condition. In some cases, leg twitching may be associated with restless leg syndrome, a condition characterised by uncomfortable sensations and an irresistible urge to move the legs.
| Characteristics | Values |
|---|---|
| Medical term | Periodic limb movements of sleep (PLMS) |
| Other names | Sleep-related myoclonus syndrome, nocturnal myoclonus syndrome, sleep myoclonus, hypnic jerks, sleep twitch, myoclonic jerk, night start |
| Type of movement | Repetitive, rhythmic, brief, sudden, involuntary muscle contractions or twitches, jerks, spasms |
| Frequency | Every 20 to 40 seconds, more than 15 times an hour in adults, more than 5 times an hour in children |
| Parts of the body affected | Legs, arms, eyelids, face |
| Possible causes | Sleep disorder, neurological disorder, restless leg syndrome (RLS), Willis-Ekbom disease, medication, dehydration, stimulants like caffeine or alcohol, epilepsy, seizures, blood and body chemistry imbalances, kidney or liver diseases, thyroid issues, autoimmune diseases, family history of restless legs syndrome, physical inactivity, old age, diabetes-related neuropathy |
| Diagnosis | Overnight sleep study (polysomnogram), blood tests, MRI scan, electroencephalogram (EEG) |
| Treatment | Medication, treating underlying conditions, lifestyle changes |
| Occurrence | Common, affects up to 70% of the general population |
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What You'll Learn
Periodic Limb Movements of Sleep (PLMS)
PLMS is a common finding in sleep studies, but its presence alone does not warrant a diagnosis of Periodic Limb Movement Disorder (PLMD). PLMD is diagnosed when there is a cause-and-effect relationship between PLMS and a sleep disturbance or daytime impairment. The diagnosis of PLMD requires ruling out other conditions such as narcolepsy, RLS, REM sleep behaviour disorder, and untreated obstructive sleep apnea.
The exact cause of PLMS is unknown, but it is believed to be related to an issue with the spinal cord or nerves sending incorrect signals. Certain medications, such as antidepressants and antihistamines, can worsen PLMS. Other risk factors include older age, diabetes-related neuropathy, a family history of RLS or PLMS, and physical inactivity.
While there is no specific treatment for PLMS, medications used to treat RLS may help. These include dopaminergic medications such as pramipexole, ropinirole, and rotigotine, as well as other drugs like gabapentin and pregabalin. Sedatives like clonazepam can improve sleep in people with PLMD but are not commonly recommended as they do not reduce the movements.
If you suspect you may have PLMD, it is important to consult a healthcare provider. They will evaluate your medical history and may recommend an overnight sleep study to monitor your heart, brain, respiratory system, and other bodily functions during sleep. Treatment options can then be discussed based on the findings.
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Restless Leg Syndrome (RLS)
Leg twitching during sleep can be caused by various factors, one of which is Restless Leg Syndrome (RLS). RLS is a neurological condition that causes an irresistible urge to move the legs. It is both a sleep disorder and a movement condition, as the symptoms are triggered by rest and the only relief comes from movement.
People with RLS experience uncomfortable sensations in their legs, such as aching, throbbing, pulling, itching, crawling, or creeping. These sensations can also occur in the arms, chest, or head, but this is less common, and they usually affect both sides of the body. The symptoms typically occur when the individual is inactive and sitting for extended periods, such as during a plane trip or while watching a movie.
RLS can severely interrupt sleep, making it difficult to fall asleep and to return to sleep after waking up. Leg movement or walking typically provides temporary relief from the discomfort, but the sensations often return as soon as the movement stops. RLS symptoms may vary from day to day and from person to person, and they can range from mild to moderately severe. With moderately severe RLS, symptoms might only occur once or twice a week but can still cause significant sleep disturbances and affect daily functioning.
RLS can develop at any age but most often begins in middle age. It occurs in both men and women but is more common in women. In most cases, the exact cause of RLS is unknown. However, there are some factors that have been associated with the condition. RLS often has a genetic component and runs in families, and specific gene variants are linked to the disorder. Low levels of iron in the brain may also be a factor in the development of RLS. Additionally, RLS may be related to a dysfunction in the basal ganglia, a part of the brain that controls movement using the brain chemical dopamine.
There are treatments available to help manage RLS symptoms and improve sleep quality. Doctors may prescribe medications such as anti-seizure drugs like gabapentin enacarbil or pregabalin, or dopaminergic agents like carbidopa/levodopa. A new technology called Tonic Motor Activation (TOMAC) has also been approved by the FDA to reduce symptoms of RLS. This system involves devices worn on the lower legs that activate the muscles and mimic the sensation of movement, providing relief from the discomfort of RLS.
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Hypnic Jerks
There are several potential causes of hypnic jercs, including anxiety, stress, fatigue, sleep deprivation, vigorous exercise, and stimulants such as caffeine and nicotine. Certain medications can also contribute to their frequency and amplitude. While hypnic jerks are usually harmless, they can be intensified in certain situations, interfering with sleep onset and even causing insomnia. In rare cases, they have been linked to the development of major depressive disorder. If hypnic jerks are causing sleep disruptions or significantly impacting an individual's quality of life, treatment may be warranted.
The exact mechanism behind hypnic jerks is not fully understood, but one theory suggests that the body mistakes the sense of relaxation felt when falling asleep as a sign that the body is physically falling. As a result, it triggers a jerking motion to wake the sleeper up so they can catch themselves. This may be an archaic reflex leftover from our evolutionary past when sleeping primates needed to avoid falling out of trees. Another theory suggests that hypnic jerks may be related to a misfire between nerves in the reticular brainstem as the body transitions from wakefulness to sleep.
While hypnic jerks themselves are not a cause for concern, they can sometimes be mistaken for other more serious conditions, such as restless leg syndrome, periodic limb movement disorder, or epileptic seizures. Therefore, if you are experiencing frequent and intense hypnic jerks or if they are causing significant sleep disruptions, it is recommended to consult a doctor to rule out any underlying health issues.
To reduce the frequency and intensity of hypnic jerks, several lifestyle changes can be implemented, including reducing consumption of stimulants like nicotine and caffeine, avoiding physical exertion before sleep, and consuming sufficient magnesium. In some cases, medications such as low-dose clonazepam at bedtime may be prescribed to help reduce or eliminate the twitches.
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Sleep Myoclonus
Myoclonus refers to sudden, brief involuntary twitching or jerking of a muscle or group of muscles. The person experiencing the twitching cannot stop or control it. Myoclonus is not a disease but a clinical sign. It can be categorised as physiologic or pathologic myoclonus. Physiologic myoclonus happens in otherwise healthy people and doesn’t need medical treatment. Some examples are hiccups and the jerks (or “sleep starts”) that some people have while drifting off to sleep. Pathologic myoclonus, on the other hand, happens because of an underlying disorder of the brain or nerves. It can also be a sign of another medical condition or a reaction to certain medications. It usually involves more persistent and severe symptoms, which may limit a person’s ability to eat, talk, or walk.
In children, sleep myoclonus can be caused by a sleep disorder known as pediatric periodic limb movement disorder (PLMD). PLMD causes brief muscle spasms in the legs or arms during sleep. It often occurs alongside developmental disorders such as attention deficit hyperactivity disorder (ADHD), autism spectrum disorders, and Tourette’s syndrome. Sleep myoclonus can also be caused by epilepsy, with juvenile myoclonic epilepsy (JME) being a common form that involves myoclonic seizures.
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Pathological Myoclonus
Myoclonus is the medical term for the sudden, rapid, brief, involuntary jerking movement of a body part or the entire body. Myoclonus is not a disease in itself but a symptom of several different conditions. Physiologic myoclonus occurs in healthy people and rarely requires treatment. Examples include hiccups, sudden jerks when startled, or twitching of the arm or leg when falling asleep.
Sleep myoclonus, or hypnic myoclonus, occurs during sleep or as a person is falling asleep. It can be a symptom of a sleep disorder, a neurological disorder, or another underlying condition. Sleep myoclonus can also occur without a known cause, and it does not always indicate a serious health issue. Medications and home remedies may help relieve myoclonic spasms, but people should consult a doctor before trying new treatments.
Periodic limb movements of sleep (PLMS) is a movement disorder that involves repetitive leg and/or arm movements during sleep, disrupting sleep quality. PLMS is diagnosed in adults who experience more than 15 limb movements per hour during sleep and in children who experience more than five limb movements per hour. There is no specific treatment for PLMS, but healthcare providers may prescribe medications used to treat restless leg syndrome, which is often associated with PLMS.
In summary, pathological myoclonus is a type of myoclonus that occurs due to an underlying disorder of the brain or nerves and can cause severe symptoms that interfere with daily activities. It is distinguished from physiologic myoclonus, which occurs in healthy individuals and does not typically require treatment. Sleep myoclonus is a specific type of myoclonus that occurs during sleep or while falling asleep and can be a symptom of various conditions, including PLMS, which involves repetitive limb movements that disrupt sleep.
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Frequently asked questions
Leg twitching while sleeping could be a hypnic jerk, which is a sudden involuntary muscle contraction that occurs as you are falling asleep. It is generally harmless and often feels like a sudden kick from your own body.
Researchers are unsure of the exact cause of hypnic jerks, but they believe it may be linked to the part of the brain that controls your startle response. They can sometimes be caused by a sleep disorder, a neurological disorder, or certain medications.
Research suggests that up to 70% of people experience hypnic jerks at some point. They are generally harmless and not a cause for concern.
Hypnic jerks are usually harmless and do not require treatment. However, if you are concerned or if the twitching is frequent or widespread, you should consult a doctor.
