Miya Pearson
Involuntary muscle twitching during sleep, known as sleep myoclonus, can occur when a person falls asleep or during sleep. Sleep myoclonus is not a disease but a symptom of several conditions, including sleep disorders and neurological disorders. However, it can also occur without an identifiable cause. While sleep myoclonus is typically harmless, it can be a source of concern for some individuals, and there are measures that can be taken to reduce its occurrence.
| Characteristics | Values |
|---|---|
| Name | Sleep myoclonus, hypnic jerk, hypnagogic jerk, sleep start, night start, myoclonic jerk |
| Description | Involuntary muscle contractions that occur as a person falls asleep or during sleep |
| Frequency | Occurs in up to 70% of people of all ages and genders |
| Severity | Can be unnoticeable or mild, but can also be intense enough to wake the person up |
| Causes | Overtiredness, uncomfortable sleeping position, stimulants (e.g. caffeine, nicotine, alcohol, drugs), exercise before bedtime, stress and anxiety |
| Treatment | Reducing caffeine and stimulant intake, exercising earlier in the day, practising relaxation techniques, medication and at-home remedies |
| Underlying Conditions | Sleep disorders (e.g. restless legs syndrome), neurological disorders, nervous system disorders, brain or nerve disorders, metabolic disorders, kidney or liver failure, autoimmune inflammatory conditions, COVID-19 |
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What You'll Learn
Sleep myoclonus
Myoclonus refers to involuntary spasms that involve a muscle or a group of muscles. Sleep myoclonus can manifest in the form of hiccups, hypnic jerks or sleep starts, and jerks. Hypnic jerks, also known as hypnagogic jerks, are involuntary muscle contractions that occur as a person falls asleep. They are common and occur randomly in people of all ages. While the exact cause of these twitches is unclear, they are not dangerous. However, a person may need to consult a doctor if they cause distress or other symptoms such as incontinence, injury, pain, or confusion. Sleep starts, also known as sleep myoclonus, are contractions that begin in one part of the body and spread to other muscles in other areas.
Physiologic myoclonus occurs in healthy individuals and does not need medical treatment. Some examples include hiccups and sleep starts. Pathologic myoclonus, on the other hand, occurs due to an underlying disorder of the brain or nerves. It can indicate another medical condition or be a reaction to certain types of medication. It usually involves more persistent and severe symptoms that may limit a person's ability to perform daily functions such as eating, talking, or walking.
The causes of sleep myoclonus vary depending on a person's age. In children, sleep myoclonus can occur as a symptom of a sleep disorder, pediatric periodic limb movement disorder (PLMD), or rhythmic movement disorder (RMD). RMD often occurs alongside developmental disorders such as ADHD, autism spectrum disorders, and Tourette's syndrome. In adults, sleep myoclonus can be caused by restless leg syndrome (RLS) or Willis-Ekbom disease, a neurological condition that causes an uncontrollable urge to move the legs. Sleep myoclonus can also be caused by certain factors such as high levels of stress and anxiety, caffeine consumption, and the use of stimulants such as nicotine, alcohol, or drugs.
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Hypnic jerks
Twitching in your sleep is known as a hypnic jerk, a hypnagogic jerk, a sleep start, a sleep twitch, a myoclonic jerk, or a night start. It is a brief and sudden involuntary contraction of the muscles of the body which occurs when a a person is beginning to fall asleep, often causing the person to jump and awaken suddenly for a moment. Hypnic jerks are common physiological phenomena, with around 70% of people experiencing them at least once in their lives and 10% experiencing them daily. They are benign and do not cause any neurological sequelae.
The exact cause of hypnic jerks is unknown, but they are thought to be associated with various factors such as stress, anxiety, fatigue, sleep deprivation, stimulants like caffeine and nicotine, certain medications, and vigorous exercise. They are more common in adults, possibly due to the higher prevalence of these factors in adulthood. Hypnic jerks can also occur when someone goes to sleep in an uncomfortable position.
While hypnic jerks are generally harmless, they can be disruptive to sleep and may cause insomnia. They can also be mistaken for other conditions, such as restless leg syndrome, periodic limb movement disorder, or a myoclonic seizure. If hypnic jerks are causing sleep disruptions or anxiety, there are ways to reduce their frequency, including reducing consumption of stimulants, avoiding physical exertion before sleep, consuming sufficient magnesium, and taking certain medications.
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Causes of sleep twitching
Sleep myoclonus is the scientific name for the involuntary and nonrhythmic muscle twitching that occurs as a person falls asleep or during sleep. Sleep myoclonus is not a disease but a symptom of several different conditions. It can also happen without a known cause.
Hypnic Jerks
Also known as hypnagogic jerks, sleep starts, or night starts, hypnic jerks are a type of sleep myoclonus. They are brief, sudden, and involuntary muscle twitches that occur as a person falls asleep. They can also happen when a person wakes up. Hypnic jerks are common and occur randomly in people of all ages. They are usually mild and harmless, but they can sometimes be intense and may even cause a minor bump or muscle spasm. They are not a cause for concern, but they can be indicative of other sleep-related issues.
Physiologic Myoclonus
Physiologic myoclonus involves quick muscle twitches followed by relaxation. They are common and occur in healthy individuals. They are usually harmless and do not cause serious complications. Examples include hiccups and hypnic jerks.
Pathologic Myoclonus
Pathologic myoclonus indicates an underlying health condition, such as a disorder of the brain or nerves. It usually involves more persistent and severe symptoms that may limit a person's ability to eat, talk, or walk. It can also be a reaction to certain types of medicine.
Stimulus-Sensitive Myoclonus
Stimulus-sensitive myoclonus is triggered by external events, including noise, movement, or light.
Essential Myoclonus
Essential myoclonus occurs without any known cause and is not associated with abnormalities in the brain or nerves. It is usually stable and does not progress over time.
Action Myoclonus
Action myoclonus is triggered by voluntary movement or a person's intention to move. It may worsen when a person attempts precise, coordinated movements.
Epileptic Myoclonus
Epileptic myoclonus occurs within an epilepsy syndrome. Juvenile myoclonic epilepsy (JME) starts around puberty and involves myoclonic seizures, usually in the neck, shoulders, or upper arms. Myoclonic-astatic epilepsy involves myoclonus followed by a loss of muscle tone.
Benign Neonatal Sleep Myoclonus (BNSM)
Benign neonatal sleep myoclonus is a condition that affects newborn babies, causing sudden jerky movements of their limbs or bodies during sleep. It is harmless, and about 95% of cases resolve by 6 months of age.
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Treatment for sleep twitching
Involuntary muscle twitching during sleep, known as sleep myoclonus, can be distressing and impact your sleep quality. While twitching during sleep does not always indicate an underlying health condition, it is important to consult a doctor if you experience frequent episodes that affect your sleep. Treatment for sleep twitching can include medications and at-home remedies, but it is crucial to consult a doctor before starting any new treatment approach. Here are some strategies that may help manage sleep twitching:
Lifestyle Changes
Making certain lifestyle changes can help reduce the occurrence of sleep twitching. These include:
- Reducing caffeine intake: Caffeine is a stimulant that can keep your body and brain alert, making it difficult to relax and increasing the likelihood of sleep twitching. Try avoiding caffeine, especially in the late afternoon and evening, to minimize its impact on your sleep.
- Avoiding stimulants: Substances like alcohol, nicotine, and drugs can act as stimulants and increase the occurrence of involuntary muscle twitches during sleep. Avoiding these substances before bedtime may help prevent sleep twitching.
- Exercising earlier in the day: While exercise is beneficial, it is advisable to exercise earlier in the day rather than close to bedtime. Exercising before bed can physically stimulate your body, making it harder to relax and potentially triggering sleep twitching.
- Practicing relaxation techniques: Techniques such as guided meditations or breathing exercises can help you relax and reduce stress levels. Lowering stress can make it easier to fall asleep and potentially reduce sleep twitching.
Medical Treatments
If lifestyle changes do not provide sufficient relief, medical treatments may be considered under the guidance of a healthcare professional:
- Medications: Certain medications can help relieve myoclonic spasms at night. However, it is important to consult a doctor before starting any new medication to understand the potential side effects and ensure safe usage.
- Alternative therapies: Limited research exists on alternative therapies for myoclonus. However, stretching and massaging problematic muscle areas may help prevent or reduce the severity of muscle spasms.
Remember, it is always advisable to consult a doctor if sleep twitching is frequent and disruptive to your sleep. They can provide personalized advice and guidance on the most suitable treatment options for your specific situation.
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Types of myoclonus
Twitching while sleeping, or sleep myoclonus, is quite common and affects up to 70% of people of all ages and genders. Myoclonus refers to the sudden, uncontrollable movement or "jerking" of muscles, which can be mild or intense enough to wake someone up. These movements are involuntary muscle spasms that can occur in a single muscle or a group of muscles.
Myoclonus can be classified in several ways, including by body parts affected, provoking factors, and physiology or the presumed source of its origin in the nervous system. Here are some types of myoclonus:
Focal or Segmental Myoclonus
Focal myoclonus affects a small region of the body, such as one hand, while segmental myoclonus involves muscle groups controlled by one or more connected parts of the spinal cord. Focal and segmental myoclonus may be treated with botulinum toxin injections, with variable success.
Generalized Myoclonus
Generalized myoclonus produces violent jerks over the entire body. It can occur in primary (idiopathic) generalized epilepsy or secondary (symptomatic) generalized epilepsies.
Cortical Myoclonus
Cortical myoclonus starts in the cerebral cortex (the outer layer of the brain). It usually involves only a few muscles in one part of the body, typically the limbs, but can also involve many muscles. It becomes more intense when a person tries to move in a certain way (action myoclonus) or in response to sensory stimulation (stimulus-sensitive myoclonus). Cortical myoclonus is typically treated with antiepileptic drugs such as valproate, levetiracetam, and piracetam.
Spinal Myoclonus
Spinal myoclonus begins in the spinal cord. It can involve muscle groups controlled by connected parts of the spinal cord. The myoclonic jerk may spread throughout the torso, beginning in the middle of the spine and spreading upwards and downwards.
Reticular Reflex Myoclonus
Reticular reflex myoclonus starts in the brainstem, which controls vital functions such as breathing. It usually affects the whole body and can be triggered by a person's movement or surroundings. It is considered a classical example of brainstem myoclonus and is sensitive to auditory stimuli.
Pathologic Myoclonus
Pathologic myoclonus is caused by an underlying disorder of the brain or nerves and can be a sign of another medical condition or a reaction to certain medications. It typically involves more persistent and severe symptoms that may limit a person's ability to eat, talk, or walk.
Essential Myoclonus
Essential myoclonus occurs on its own without an underlying medical condition or abnormalities in the brain or nerves. It is typically stable and does not progress or progresses very slowly over time. It can be inherited or occur in people with no family history of neurological disease.
Sleep Myoclonus
Sleep myoclonus, also known as hypnic myoclonus or hypnic jerks, occurs during sleep transitions, especially as a person is drifting off to sleep. It can be influenced by factors such as stress, anxiety, caffeine, or physical exhaustion. While sleep myoclonus is generally harmless, it may be a symptom of more complex sleep disorders or neurological conditions in some cases.
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Frequently asked questions
Twitching in your sleep is known as sleep myoclonus, which is characterised by involuntary, nonrhythmic muscle twitching that occurs either as a person falls asleep or during sleep.
The exact cause of sleep myoclonus is unknown. However, several factors may increase the likelihood of twitching, such as high levels of stress and anxiety, caffeine, nicotine, drugs, alcohol, and exercise before bedtime.
For most people, twitching is not a sign of an underlying condition. However, in some cases, it can be a symptom of a sleep disorder or a neurological disorder. If you are concerned about twitching in your sleep, consult a doctor.
To reduce twitching in your sleep, you can try to avoid caffeine, alcohol, drugs, nicotine, and other stimulants before bedtime. It is also recommended to exercise earlier in the day and practice relaxation techniques to help your body relax before sleep.
