Miya Pearson
Involuntary muscle twitching or spasms during sleep, or while falling asleep, are known as sleep myoclonus. This phenomenon is also commonly referred to as hypnic jerks, sleep starts, or night starts. While hypnic jerks are generally harmless, they can sometimes be indicative of an underlying sleep disorder or neurological condition. They can be caused by various factors, including stress, anxiety, caffeine consumption, and physical exhaustion. Certain medications, underlying medical conditions, and mental health issues can also contribute to sleep myoclonus. In rare cases, these involuntary muscle spasms may result in minor injuries or cramps. While treatment is typically unnecessary, severe cases may require medication or alternative therapies.
| Characteristics | Values |
|---|---|
| Name | Sleep myoclonus, also known as hypnic jerks, hypnagogic jerks, sleep starts, or night starts |
| Description | Involuntary, nonrhythmic muscle twitching or spasms that occur as a person falls asleep or during sleep |
| Movements | Jerks, hiccups, starts, rocking, head-jerking, quivering, twitching |
| Severity | Can be unnoticeable or mild, but can also be intense enough to wake someone up |
| Causes | Stress, anxiety, caffeine, physical exhaustion, stimulants (e.g. drugs, alcohol, nicotine), underlying medical conditions, mental health conditions, medication side effects, developmental disorders (e.g. ADHD, autism spectrum disorders, Tourette's syndrome), seizure disorders, nervous system disorders (e.g. multiple sclerosis, dementia, Parkinson's disease), sleep disorders (e.g. restless legs syndrome), neurological conditions |
| Treatment | No treatment needed if it does not interfere with sleep; if bothersome, reduce caffeine and stimulant intake, practice relaxation techniques, treat underlying conditions, medication (e.g. tetrabenazine, clonazepam, anti-seizure drugs) |
| Prevalence | Common, affecting up to 70% of people of all ages and genders |
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What You'll Learn
- Stress and stimulants, such as caffeine, nicotine, drugs, and alcohol, can cause muscle spasms
- Sleep myoclonus can be a symptom of several conditions, including Huntington's disease, CJD, and epilepsy
- Myoclonus can be treated with medication, such as benzodiazepines, anti-seizure drugs, and 5-hydroxytryptophan
- Physiologic myoclonus is a type of myoclonus that occurs in healthy people and doesn't require treatment
- Myoclonus can be caused by a disruption of the brain or spinal cord or an injury to the peripheral nerves
Stress and stimulants, such as caffeine, nicotine, drugs, and alcohol, can cause muscle spasms
Muscle spasms can be caused by stress and stimulants such as caffeine, nicotine, drugs, and alcohol. Muscle twitches are extremely common, and most people experience them several times throughout their lives. While they can be annoying, it is very rare for muscle twitches to be the initial sign of a serious illness.
Stress and anxiety can cause muscle twitching. When your brain interprets anxiety as stress, it sends signals to your body that trigger muscle spasms. These spasms can occur in different muscle groups at any time. Learning how to effectively manage stress and anxiety can help prevent and manage anxiety-induced muscle twitching. Cognitive behavioural therapy is commonly recommended to help manage stress and treat anxiety disorders.
Caffeine and other stimulants can keep your body in a hyperstimulated state, making you more susceptible to muscle spasms. Cutting down on caffeine may help reduce muscle twitching.
Chronic abuse of powerful stimulants such as cocaine and methamphetamine can produce brain damage, compromising the functioning of the central nervous system and the musculoskeletal system, which can lead to movement problems.
Additionally, numerous drugs of abuse can place a significant burden on the heart, leading to deterioration of the heart muscle (cardiomyopathy), high blood pressure, and heartbeat irregularities (arrhythmias). These conditions can increase the risk of serious heart disease, including a heart attack.
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Sleep myoclonus can be a symptom of several conditions, including Huntington's disease, CJD, and epilepsy
Sleep myoclonus is characterised by involuntary, nonrhythmic muscle twitching that occurs when a person falls asleep or during sleep. It is not a disease in itself but a symptom of several conditions, including Huntington's disease, CJD, and epilepsy.
Huntington's disease
Huntington's disease (HD) is a genetic disorder caused by autosomal dominant mutation, leading to progressive neurodegenerative changes in the central nervous system. Common symptoms of HD include involuntary movements, cognitive and psychiatric disturbances, and sleep abnormalities. Sleep problems in HD patients may be caused by the involuntary movements associated with the disease, which can make it difficult to change position during sleep. Studies have shown increased motor activity during sleep in HD patients, including periodic limb movements and behavioural disorders during REM sleep.
CJD
CJD (Creutzfeldt-Jakob disease) is a progressive brain disorder that leads to cognitive and behavioural changes, involuntary muscle jerks, and loss of coordination. It typically affects adults aged 60 years or older. While the exact cause of CJD is unknown, treating any underlying condition that contributes to myoclonus can help alleviate the muscle spasms associated with the disorder.
Epilepsy
Myoclonus is frequently observed in people with epilepsy. Juvenile myoclonic epilepsy (JME) is a form of epilepsy characterised by myoclonic seizures, which account for 5 to 10% of all epilepsy cases. Myoclonic seizures are caused by abnormal electrical activity in the brain and can lead to muscle jerking. They often occur during or near sleep and may precede tonic-clonic seizures. Certain types of epilepsy may manifest primarily through myoclonus, while in other cases, myoclonus may occur alongside other types of seizures. EEG tests can be used to detect seizure activity and are particularly beneficial for diagnosing myoclonic seizures, as they often occur near sleep.
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Myoclonus can be treated with medication, such as benzodiazepines, anti-seizure drugs, and 5-hydroxytryptophan
Myoclonus is a sudden muscle spasm that is involuntary and unpredictable. It can be a natural reflex, like jumping when startled, or it could be a sign of a nervous system condition such as multiple sclerosis, dementia, or Parkinson's disease. Myoclonus can also be a symptom of several different conditions, including epilepsy, Huntington's disease, and Restless Leg Syndrome (RLS). While it is not a disease in itself, myoclonus can cause disruptive symptoms that interfere with sleep.
Anti-seizure medications, such as levetiracetam (Keppra), primidone (Mysoline), and valproic acid (Valproic), are also effective in treating myoclonus. These drugs help prevent seizures associated with epilepsy but can also reduce the frequency and severity of muscle spasms. Side effects may include nausea, fatigue, and dizziness.
5-hydroxytryptophan (5-HTP) is another treatment option for myoclonus. It is a building block of serotonin, an important neurotransmitter. Some studies have shown that 5-HTP can help manage certain forms of myoclonus. This treatment was initially reported as beneficial but is now rarely used.
In addition to these medications, other treatments for myoclonus include non-invasive brain stimulation procedures, such as transcranial magnetic and electrical stimulation techniques, as well as occupational therapy, speech therapy, and physiotherapy in selected cases. Treating any underlying conditions that contribute to myoclonus can also help alleviate the muscle spasms.
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Physiologic myoclonus is a type of myoclonus that occurs in healthy people and doesn't require treatment
Muscle spasms while attempting to sleep could be a sign of sleep myoclonus. Myoclonus is the medical term for sudden, rapid, brief, involuntary jerking movements of a body part or the entire body. These shock-like movements may be caused by sudden muscle contractions (positive myoclonus) or sudden losses of muscle tone (negative myoclonus).
Sleep myoclonus is involuntary, non-rhythmic muscle twitching that occurs either as a person falls asleep or during sleep. It is not a disease but a symptom of several different conditions. Sleep myoclonus can also happen without a known cause. The symptoms of sleep myoclonus occur when a person falls asleep or during sleep, causing unpredictable and involuntary muscle jerks or spasms that may affect a single muscle or multiple muscle groups.
Physiologic myoclonus is a type of myoclonus that occurs in healthy people and rarely requires treatment. It includes quick muscle twitches followed by relaxation. Some examples of physiologic myoclonus are hiccups and the jerks (or "sleep starts") that some people experience while drifting off to sleep. Sleep starts are also known as hypnic jerks and are the shock-like twitches that some people experience while falling asleep.
Pathological myoclonus, on the other hand, may be extremely disabling and may be caused by an underlying disorder of the brain or nerves. It can also be a sign of another medical condition or a reaction to certain types of medication. It usually involves more persistent and severe symptoms that may limit a person's ability to eat, talk, or walk. Essential myoclonus is a type of myoclonus that occurs without an underlying medical condition and is sometimes inherited.
If myoclonus keeps happening, especially if it starts disrupting your daily activities, you should consult a healthcare provider. Myoclonus that disrupts your life may be a sign of more serious issues.
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Myoclonus can be caused by a disruption of the brain or spinal cord or an injury to the peripheral nerves
Myoclonus is a type of uncontrollable movement that includes sudden, brief involuntary twitching, jerking, or spasms of a single muscle or a group of muscles. It is not a disease but a symptom of several different conditions. Myoclonus can occur by itself or as a symptom of a wide variety of nervous system disorders. It can be caused by a disturbance of the brain or spinal cord (the central nervous system or CNS) or, in rare cases, by an injury to the peripheral nerves (the nerves outside the CNS that connect to sensory organs and muscles and relay information to and from the CNS).
Myoclonus can be classified in several ways, including by distribution (body parts affected) and by provoking factors (spontaneous and reflex). It can also be classified by physiology, meaning the presumed source of its origin in the nervous system: cortical (brain), subcortical (between the brain and spinal cord), spinal, or peripheral (nerves outside the CNS). Cortical myoclonus starts in the cerebral cortex (the outer layer of the brain), while spinal myoclonus originates in the spinal cord and may involve the whole trunk, spreading up and down in a phenomenon known as propriospinal myoclonus. Peripheral myoclonus refers to myoclonic jerks that originate from a peripheral nerve, with hemifacial spasm being the most common example.
The specific mechanisms underlying myoclonus are not yet fully understood. However, studies suggest that several locations in the brain are involved, including the brainstem, which is located close to structures responsible for the startle response, an automatic reaction to unexpected stimuli involving rapid muscle contraction. Scientists believe that some types of stimulus-sensitive myoclonus may involve the over-excitability of the parts of the brain that control movement, which are interconnected in a series of feedback loops called motor pathways. These pathways facilitate and modulate communication between the brain and muscles.
Myoclonus can be diagnosed through a review of the patient's medical history and a physical exam, and additional tests may be ordered, such as electromyography (EMG) to measure electrical activity from muscles, electroencephalography (EEG) to record electrical activity in the brain, and evoked potential studies to capture electrical activity in the brain, brain stem, and spinal cord evoked by specific stimuli. Brain imaging is also used to identify the source of peripheral myoclonus, particularly in cases of hemifacial spasm, where it is important to evaluate the presence of underlying causes such as blood vessels or tumors pushing against the seventh cranial nerve.
While there are no medications specifically designed to treat myoclonus, medications that reduce an overactive nervous system are generally used to relieve symptoms. Treating any underlying conditions that contribute to myoclonus can help alleviate unwanted muscle spasms. Surgery may be an option if myoclonus symptoms result from a tumor or lesion in the brain or spinal cord, or if the condition affects parts of the face or ear. Deep brain stimulation, where electrodes are implanted in certain areas of the brain to block irregular impulses, has also been performed in some cases.
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Frequently asked questions
Muscle spasms when attempting to sleep are known as sleep myoclonus. They are involuntary muscle twitches that occur as a person falls asleep or during sleep.
The exact cause of muscle spasms when attempting to sleep is unknown. However, several factors may contribute to them, including stress, anxiety, caffeine, stimulants, and physical exercise before bedtime.
Muscle spasms when attempting to sleep are typically not harmful and do not require medical treatment. However, they can be intense enough to wake someone up and may indicate an underlying sleep disorder or nervous system disorder in some cases.
To reduce muscle spasms when attempting to sleep, it is recommended to avoid caffeine, stimulants, and physical exercise close to bedtime. Relaxation techniques, such as breathing exercises or guided imagery, may also help minimize twitching.
