
Laughing in your sleep, also known as hypnogely, is a common phenomenon that occurs during the REM phase of sleep, when dreaming is most intense. While it is usually harmless, in rare cases it can be a sign of a sleep disorder or other medical condition. Laughing in sleep can be caused by a variety of factors, including dreaming, processing emotions, neurological or psychological factors, or simply an expression of your subconscious dealing with dreams or memories in a humorous way. For babies and young children, laughing in their sleep is typical and not usually a cause for concern.
| Characteristics | Values |
|---|---|
| Occurrence | Laughing in sleep usually occurs during the REM phase of sleep, but it can also occur during non-REM sleep. |
| Causes | Laughing in sleep is often caused by dreaming, specifically bizarre or funny dreams. It can also be caused by the processing of emotions, neurological or psychological factors, or stress and anxiety. In babies, it can be caused by positive dreams or seizures in rare cases. |
| Harmless vs Harmful | Laughing in sleep is typically harmless and natural. However, in rare cases, it can indicate a sleep disorder, neurological problems, or psychological stress. |
| Treatment | Laughing in sleep usually requires no treatment. However, if it occurs frequently, affects sleep quality, or is accompanied by other symptoms, consulting a healthcare provider is advised. |
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What You'll Learn
- Laughing in sleep, or hypnogely, is usually harmless
- It can be a response to something funny or bizarre in a dream
- In rare cases, it could be a symptom of REM sleep behaviour disorder
- Laughing in sleep can also be caused by neurological or psychological factors
- In babies, laughing in sleep is common and not a cause for concern

Laughing in sleep, or hypnogely, is usually harmless
Laughing in sleep usually happens during REM sleep, the deepest stage of sleep, during which people dream. REM sleep is characterised by decreased body tension, a slight increase in heart rate, and rapid eye movements. It is the only time when people dream, and it is when most laughing in sleep occurs. It is also common for people to make other vocalisations during REM sleep, such as talking or crying, which could indicate different dream experiences or emotional processing.
Laughing in sleep is particularly common in babies and young children. This is because they enter the REM sleep phase much more frequently throughout the night than adults. Babies and children also laugh much more during the day than adults, so they laugh more during sleep, too. In babies, laughing in sleep can occur at any age but is most common in infants and young children. It is not typically a cause for concern and does not necessarily indicate any underlying medical conditions or sleep disorders.
However, in rare cases, laughing in sleep can be a sign of something more serious. It can be a symptom of REM sleep behaviour disorder (RBD), during which people act out their dreams physically. This can result in injuries to the sleeper or their sleep partner. Less than 1% of people have this sleep disorder, but it is more common in older males. Laughing in sleep can also be associated with non-REM sleep arousal parasomnias, which are like being half-asleep and half-awake. These episodes are usually shorter and more common in children but can also happen to adults.
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It can be a response to something funny or bizarre in a dream
Laughing in your sleep is usually a harmless occurrence and nothing to worry about. It is often a natural response to something funny or bizarre in a dream. This phenomenon is known as "hypnogely" or "somniloquy", a type of parasomnia, which is any unusual behaviour that occurs during sleep.
During sleep, our brains process the events of the day, and the feelings associated with them. Laughing in your sleep is simply an expression of your subconscious dealing with dreams or memories in a humorous way. It is not uncommon to laugh at something bizarre or funny in a dream, and this is a completely natural and healthy process.
REM sleep is the deepest stage of sleep, and it is the only time that people dream. It is characterised by decreased body tension, a slight increase in heart rate, and rapid eye movements. During this stage, most people experience muscle atonia, which means that the body is effectively in paralysis. However, in rare cases, people with REM sleep behaviour disorder (RBD) do not experience this paralysis and may act out their dreams physically, which can include laughing out loud.
While laughing in your sleep is typically harmless, it can sometimes be a sign of something more serious. If it occurs frequently, is accompanied by other symptoms such as violent movements or aggressive behaviour, or if it affects your quality of sleep or that of your bed partner, it may be advisable to consult a healthcare provider to rule out any underlying sleep disorders or medical conditions.
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In rare cases, it could be a symptom of REM sleep behaviour disorder
Laughing in your sleep is usually a harmless response to something occurring in a dream. Dreams can often seem odd or bizarre upon waking, and laughing during sleep is simply an expression of your subconscious dealing with dreams or memories in a humorous way.
However, in rare cases, laughter during sleep can be a symptom of REM sleep behaviour disorder (RBD). REM sleep is the deepest stage of sleep, the only time when people dream. During this stage, most people experience muscle atonia, or temporary paralysis, which means the body is effectively shut down. However, people with RBD do not experience this paralysis and may act out their dreams physically. This can include talking, laughing, shouting, or violent movements such as flailing limbs, and it can result in injuries to the person or their sleep partner. Less than 1% of people have this sleep disorder, but it is more common in older males. It is also associated with other disorders, including Lewy body dementia and Parkinson’s disease.
If laughter during sleep is accompanied by other noticeable symptoms such as violent crying, aggressive behaviour, or strong physical activity, it could indicate a sleep disorder or other medical condition, and it is advisable to consult an expert. Laughing in sleep can also be associated with non-REM sleep arousal parasomnias, which are similar to being half-asleep and half-awake. These episodes are usually shorter, lasting less than an hour, and are more common in children but can also occur in adults.
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Laughing in sleep can also be caused by neurological or psychological factors
Laughing in sleep, also known as hypnogely, is usually a harmless response to dreams. However, in some cases, it can be caused by neurological or psychological factors.
REM sleep behaviour disorder (RBD) is a condition where people act out their dreams physically due to a lack of muscle relaxation. This can result in violent movements, talking, laughing, shouting, or even crying. RBD is associated with other neurological disorders such as Lewy body dementia and Parkinson's disease. Laughing in sleep accompanied by these additional symptoms could indicate the presence of RBD or another sleep disorder.
Parasomnias are a category of sleep disorders that involve unusual behaviours during sleep, including abnormal movements, perceptions, or emotions. Laughing in sleep can be classified as a parasomnia when it occurs alongside other symptoms like sleepwalking, talking, or sleep terrors. These episodes typically last less than an hour and are more common in children but can also occur in adults.
In rare instances, laughing in sleep can be a sign of neurological problems or psychological stress. If laughter during sleep is frequent and disruptive to the individual or their bed partner, it may be advisable to consult a healthcare provider for further evaluation.
Additionally, stress, anxiety, prescription side effects, or underlying medical issues can contribute to sleep laughing. While these factors do not always indicate a serious condition, they can influence the quality of sleep and warrant attention.
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In babies, laughing in sleep is common and not a cause for concern
Laughing in sleep is usually a harmless response to something that occurs during a dream. It often happens during REM sleep, the deepest stage of sleep, when most dreaming occurs. During this time, people experience muscle atonia, or temporary paralysis, to prevent them from acting out their dreams. However, in rare cases, laughing in sleep can be a sign of REM sleep behaviour disorder (RBD), where muscle atonia is absent, leading to physical acting out of dreams.
In babies, laughing in sleep is common and not typically a cause for concern. It is often a reflexive response to stimuli, contributing to the development of their facial muscles and social skills. Studies have found that babies imitate adult facial expressions, including smiles and laughter, as part of their early social development. This can occur even before they are born and continues as they grow, with their first real social smile often happening around two months old and their first real laugh around six months.
Babies may also laugh in their sleep due to dream-like activity during active sleep stages. Similar to adults, they experience REM sleep, with varied brain waves similar to the awake state. Their breathing becomes irregular, and their heartbeat and blood pressure resemble those of wakefulness. While their limbs are typically paralysed during REM sleep, they can still make involuntary movements, resulting in smiles and laughter.
In very rare cases, laughter during sleep in babies can be a sign of gelastic seizures, a type of seizure that causes uncontrollable laughter. These seizures are short, lasting around 10 to 20 seconds, and can start around 10 months of age. They may occur as the baby is falling asleep or while asleep and can be accompanied by a vacant stare or unusual bodily movements. If parents notice regular occurrences of these seizures, multiple times a day, seeking medical advice is recommended.
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Frequently asked questions
Laughing in your sleep is usually normal and harmless. It is often a natural response to something occurring in a dream, which may seem odd or bizarre upon waking.
Sleep laughing usually occurs during the REM phase of sleep, when most dreaming occurs. It can also occur during non-REM sleep, but this is rarer.
Sleep laughing is called "hypnogely" or "somniloquy". It is a type of parasomnia, which is any unusual behaviour that occurs during sleep.
Sleep laughing is typically harmless and does not require treatment. However, if it occurs frequently, disturbs your sleep, or is accompanied by other symptoms like violent movements or aggressive behaviour, it could indicate a sleep disorder or other medical condition. In rare cases, it may signal a neurological problem.
















