
Biting your tongue while asleep is a phenomenon known as nocturnal tongue-biting. It is usually a result of an underlying medical condition such as epilepsy, sleep apnea, or bruxism (teeth grinding). While nocturnal tongue-biting can occur due to various reasons, it is often associated with excessive movement during sleep, including tongue biting, which can be caused by conditions such as epilepsy and restless leg syndrome. In addition, sleep apnea, a condition where breathing pauses frequently throughout the night, can lead to thrashing and an increased risk of tongue-biting. Tongue-biting during sleep can also be caused by bruxism, which is characterized by teeth grinding and clenching and can lead to chronic tongue biting.
| Characteristics | Values |
|---|---|
| Frequency | Occasional tongue bites are common, but chronic tongue biting may be a symptom of an underlying medical condition. |
| Cause | Potential causes include nocturnal seizures, epilepsy, sleep apnea, bruxism, malocclusion, rhythmic movement disorder, and stress. |
| Treatment | Home treatment is often sufficient for minor tongue bites. Mouth guards can help prevent tongue biting during sleep and reduce damage to teeth and tongue. |
| Prevention | Reducing stress, engaging in restful sleep habits, and addressing underlying medical conditions can help prevent tongue biting during sleep. |
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What You'll Learn

Seizures and epilepsy
Tongue biting during sleep can be a symptom of nocturnal epileptic seizures. Epilepsy is a neurological condition that occurs in the brain, causing the body to lose control and convulse. During a seizure, a person may bite their tongue, lips, and cheeks, leading to oral injuries such as bruising, hematomas, and lacerations. The risk of tongue biting is particularly high in generalized tonic-clonic seizures.
Seizures are often undiagnosed as they are rarely witnessed by physicians, and diagnosis is typically based on patient history. Tongue biting is considered indicative of epileptic seizures, and its presence can aid in distinguishing epileptic from non-epileptic events. However, sleep-related tongue biting may not always be a sign of epilepsy and could be related to sleep-related facio-mandibular myoclonus (SRFM), a rare parasomnia that can cause tongue biting during non-rapid eye movement sleep. SRFM should be considered when tongue biting episodes are unresponsive to anti-epileptic drugs.
Nocturnal epileptic seizures can occur during sleep, and the person experiencing them may be unaware of their occurrence. These seizures can result in oral complications, such as damage to the teeth, periodontal ligaments, and the temporomandibular joint. To prevent oral injuries during seizures, a person can apply gentle pressure under the jaw, forcing the tongue back and the jaw closed.
Antiseizure medications are the primary treatment for nighttime seizures caused by epilepsy. However, it is important to take the medication as prescribed to prevent seizures and tongue biting. If seizures or tongue biting persist despite medication, it is advisable to consult a doctor about adjusting the dosage.
In summary, tongue biting during sleep can be a symptom of nocturnal epileptic seizures, but it may also be related to other conditions like SRFM. Epilepsy causes a loss of body control during seizures, leading to tongue biting and other oral injuries. Diagnosis and treatment of epilepsy are crucial to prevent oral complications and manage the condition effectively.
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Bruxism (teeth grinding)
Biting your tongue while asleep can be caused by several factors, one of which is bruxism, or teeth grinding and clenching. Bruxism is a common movement problem that can affect people during sleep, causing soreness, pain, and injury to the teeth and jaws. It can also lead to a person biting their tongue and cheeks.
Bruxism, or teeth grinding, is characterised by the continual grating of the top teeth against the bottom or consistent clenching of the jaw muscles. This condition often occurs during sleep, with individuals subconsciously clenching and grinding their teeth. It can result in chronic tongue biting and other dental concerns, such as chipped or broken teeth.
The causes of bruxism are not yet fully understood by experts. However, it is often associated with stress and certain personality traits. Individuals experiencing nervous tension, anger, pain, or frustration are more prone to bruxism. Additionally, aggressive, hurried, or highly competitive people may be more susceptible. In some cases, an imbalance in brain neurotransmitters has been implicated. Certain medications, such as antidepressants, have also been linked to bruxism.
The condition can lead to several signs and symptoms. Individuals with bruxism may experience frequent awakenings or disturbances in their sleep cycle. They might also exhibit tight or tired jaw muscles, especially in the morning. Other symptoms include earaches, a feeling of fullness in the ears, jaw soreness, headaches, and tooth wear.
Treatment for bruxism aims to reduce tooth damage, alleviate pain, and prevent further complications. Mouthguards or splints are commonly prescribed to be worn during sleep, protecting the teeth from grinding and reducing pressure on the jaw. Dental correction, such as braces or reshaping the biting surfaces of the teeth, may be necessary in cases of misaligned teeth or abnormal bites. Stress management techniques, including counselling, exercise, meditation, and relaxation strategies, can also help reduce grinding. Behavioural therapies, such as biofeedback, can increase awareness and aid in breaking the habit.
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Stress and fatigue
Biting your tongue while asleep can be a symptom of an underlying medical condition, such as epilepsy, sleep apnea, or bruxism. Bruxism, or teeth grinding, is often associated with severe emotional changes, such as fear, stress, and anxiety. It can also be caused by other factors such as diet, genetics, smoking, alcohol consumption, caffeine intake, and snoring.
Fatigue and lack of restful sleep can also contribute to nocturnal tongue biting. Being overly tired can cause the jaw to clench involuntarily, increasing the risk of accidental bites. Therefore, ensuring adequate and quality sleep is essential to prevent this issue.
Additionally, stress and anxiety can lead to muscle tension and tightness, especially during sleep. This tension may result in clenching the jaw and biting the tongue with significant force, causing pain and discomfort.
To address tongue biting related to stress and fatigue, it is crucial to focus on stress reduction and improving sleep quality. This may involve stress management techniques, relaxation practices, and maintaining a consistent sleep schedule. In some cases, custom-made night guards or mouthguards can be used to prevent tongue damage and soften the bite.
If tongue biting persists or is accompanied by other symptoms, it is advisable to consult a healthcare professional or a sleep specialist to rule out any underlying medical conditions and receive appropriate treatment.
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Sleep apnea
Biting your tongue during sleep can be a symptom of an underlying medical condition, such as sleep apnea, a sleep disorder that causes breathing to stop and start. Obstructive sleep apnea originates in the back of the mouth, and can lead to tongue biting. Dentists can help treat sleep apnea symptoms with special dental appliances, such as mouthguards or oral appliances, to prevent tongue biting and dental damage. Oral appliances can also help manage other symptoms of sleep apnea, such as snoring. In addition, sleep apnea can be treated by quitting smoking, with the help of a doctor.
Sleep bruxism, or teeth grinding and clenching, is another common movement problem that can cause tongue biting. It can be caused by stress or anxiety and is often a warning sign of sleep apnea. Bruxism can lead to soreness, pain, and injury to the teeth, jaws, and tongue. While mouthguards do not stop the behaviour, they can reduce damage by serving as a buffer between the teeth.
Other potential causes of tongue biting during sleep include nocturnal seizures, rhythmic movement disorder, epilepsy, Lyme disease, and facio-mandibular myoclonus. Seizures and epilepsy are often treated with medication and therapies from a specialist, while rhythmic movement disorder usually resolves on its own but can be managed with medication. Facio-mandibular myoclonus is a rare neurologic disorder that may be misdiagnosed as epilepsy or bruxism, and can be treated with medication.
If you are experiencing frequent tongue biting during sleep, it is important to seek medical advice to determine the underlying cause and receive appropriate treatment.
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Malocclusion (misaligned teeth)
Biting your tongue while asleep can be caused by several factors, including nocturnal seizures, rhythmic movement disorder, bruxism, and tongue slipping between misaligned teeth (malocclusion). While nocturnal seizures and rhythmic movement disorder are less common in adults, bruxism and malocclusion are more prevalent causes of tongue biting during sleep.
Malocclusion, or misaligned teeth, is a common dental issue, affecting around 56% of people worldwide. It refers to the incorrect positioning of the jaw and teeth, resulting in an improper bite. The upper teeth typically overlap the lower teeth slightly, preventing the biting of cheeks and lips, while the lower teeth protect the tongue. However, in individuals with malocclusion, this alignment is disrupted, leading to potential oral health complications.
There are different types of malocclusion, classified based on the severity and specific bite abnormalities. Class 1 malocclusion is the most common, characterized by a typical bite but with some degree of teeth misalignment. Class 2 malocclusion, or retrognathism, occurs when the upper jaw and teeth significantly overlap the lower jaw and teeth, resulting in an overbite. Class 3 malocclusion, or prognathism, is when the lower jaw protrudes forward, causing an underbite.
Malocclusion can be caused by various factors, many of which are hereditary or related to childhood habits. Hereditary factors include differences in the size of the upper and lower jaws or variations in jaw and tooth size, leading to tooth overcrowding or abnormal bite patterns. Childhood habits such as prolonged thumb sucking, tongue thrusting, extended pacifier use beyond age 3 or 4, and prolonged bottle use can also contribute to malocclusion.
The treatment options for malocclusion depend on the severity of the condition and its impact on oral health and function. In many cases, mild malocclusion does not require treatment. However, if malocclusion affects an individual's oral health, function, or confidence, orthodontic treatment or oral surgery may be recommended. Early detection and treatment of malocclusion can lead to better outcomes and reduced treatment durations.
In summary, malocclusion, or misaligned teeth, can increase the likelihood of tongue biting during sleep due to the incorrect positioning of the jaw and teeth. This condition is relatively common and can be addressed through orthodontic treatment or oral surgery if it interferes with oral health or causes discomfort.
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Frequently asked questions
There are several reasons why you might bite your tongue in your sleep. One common cause is nocturnal seizures, which can cause tongue biting and are a symptom of epilepsy. Bruxism, or teeth grinding and clenching, can also cause tongue biting during sleep. Malocclusion, or misaligned teeth, can increase the chances of tongue biting by causing the jaw to sit incorrectly.
If you are biting your tongue due to bruxism, a mouth guard can help to prevent this by keeping your teeth slightly apart, making it harder for your tongue to get stuck between them. Reducing overall stress levels and ensuring you get enough restful sleep can also help to reduce the frequency of involuntary muscle contractions when you're sleeping, including those involving the jaw and mouth.
If you bite your tongue in your sleep, you should rinse your mouth with water first to remove any blood or debris. If there is swelling, try using ice cubes wrapped in cloth or ice pops. If the tongue is bleeding, apply pressure with a sterile gauze pad or a clean cloth. If the bleeding continues after 15 minutes, consider seeking medical help.












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