Gina Johnson
Waking up laughing or giggling is a common phenomenon, with some people laughing quietly and briefly, while others burst into loud, boisterous laughter. The most common cause of laughing while asleep is having a strange dream. However, in rare cases, it could be a sign of a neurological condition or a sleep disorder like REM Behaviour Disorder (RBD). In babies, laughing in their sleep is usually a reflex and a sign of a healthy nervous system and normal brain development.
| Characteristics | Values |
|---|---|
| Frequency | Common |
| Occurrence | Second half of the night |
| Cause | Strange dreams, processing of emotions, neurological or psychological factors |
| Accompanying symptoms | Talking, screaming, violent movements, flailing limbs |
| Age | More common in babies, young children, and middle school children |
| Health | Harmless, but in rare cases linked to neurological conditions |
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What You'll Learn
Laughing in sleep is usually harmless
The most common cause of laughing while asleep is having a strange dream. Sleep partners often describe a chuckling or giggling sound, which tends to wake the dreamer up. Once awake, they may say that the dream was odd or bizarre rather than funny. Sleep talking and sleep giggling are also common, and laughing in sleep can be a result of a funny experience during the day being replayed by the subconscious mind during sleep.
In rare cases, sleep laughter can be linked to neurological conditions such as Parkinson's disease, which can cause REM behaviour disorder (RBD). Less than 1% of people have RBD, but it tends to be more common in older males. It is characterised by physical movements such as flailing limbs, and can result in injuries to the person or their sleep partner. In some cases, laughter during sleep can be a symptom of gelastic seizures, which are caused by hypothalamic hamartoma (HH). These seizures can happen many times a day and last around 10-20 seconds.
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It can be caused by a strange dream
Laughing in sleep is usually harmless and can be caused by a strange dream. Sleep partners often describe a chuckle or giggle, which tends to wake the dreamer up. However, once awake, they may say that the dream was odd or bizarre rather than funny.
In some cases, laughter during sleep can be a symptom of REM sleep behaviour disorder (RBD). People with RBD act out their dreams with physical movements, such as wild, flailing limbs. This 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 mostly affects males over the age of 50, and the average age of onset is around 60 years. People with neurological conditions such as Parkinson's disease or multiple system atrophy are up to 50% more likely to develop RBD.
Babies and young children often laugh in their sleep, and this is usually a sign that they are dreaming. Babies under six months likely don't dream, so their smiles and giggles are probably more of a reflex. However, babies spend about 50% of their time in the REM phase, which is linked with dreaming in adults. They may also smile or laugh as a reflex to a loud noise while sleeping.
In rare cases, sleep laughing can be linked to neurological conditions such as Parkinson's disease or hypothalamic hamartoma (HH). HH can cause gelastic seizures, which are bouts of uncontrolled laughter or giggling that can happen at any time but often occur as the person is falling asleep.
Laughter during sleep can also be caused by the brain processing emotions and experiences from the day. So, if you experienced something funny during the day, your subconscious mind might replay this during sleep and make you laugh.
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Sleep laughing can be linked to neurological conditions
Sleep laughing, also known as hypnogely, is a relatively common occurrence. It is usually harmless and occurs during the REM stage of sleep, which is associated with dreams. However, in rare cases, sleep laughing can be linked to neurological conditions.
REM sleep behaviour disorder (RBD) is a sleep disorder that affects less than 1% of the population, predominantly older males. It causes people to act out their dreams physically, which can result in injuries to themselves or their sleep partners. People with neurological conditions such as Parkinson's disease or multiple system atrophy are up to 50% more likely to develop RBD. Thus, RBD may be one of the rare neurological conditions that can cause sleep laughing.
Another rare neurological condition that can lead to sleep laughing is hypothalamic hamartoma (HH). HH causes gelastic seizures, which are bouts of uncontrolled laughter or giggling. These seizures can occur at any time but often happen as a person is falling asleep. They can last around 10-20 seconds and may be accompanied by a vacant stare or unusual bodily movements.
In infants, gelastic seizures can occur as early as 10 months old and may manifest as uncontrolled giggling or laughter during sleep. Although these seizures can be concerning for parents, they are typically not a cause for worry. However, if they occur regularly and are accompanied by other unusual behaviours, it is essential to consult a doctor for further evaluation.
While sleep laughing is typically harmless, these rare cases illustrate the potential link between sleep laughing and neurological conditions. In the presence of other unusual behaviours or concerning symptoms, it is always advisable to seek medical advice to rule out any underlying health issues.
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It could be a symptom of REM sleep behaviour disorder
Laughing in sleep is usually harmless and can be caused by a funny dream or the brain processing emotions and experiences from the day. However, in rare cases, it can be a symptom of REM sleep behaviour disorder (RBD).
RBD is a sleep disorder characterised by the absence of muscle atonia, which is typically associated with REM sleep. This results in the physical enactment of dreams, often involving wild and flailing limb movements. The disorder tends to worsen over time and is more prevalent among older males, typically affecting those over 50 years of age. People with neurological conditions such as Parkinson's disease or multiple system atrophy are at an increased risk of developing RBD.
If laughing in sleep is accompanied by other unusual behaviours or parasomnias, such as talking, screaming, or violent movements, it could be indicative of RBD. In such cases, it is important to seek medical advice to rule out any underlying sleep disorders or neurological conditions.
While sleep laughing is generally benign, it can occasionally be a cause for concern. For example, in rare cases, it could be a symptom of a neurological condition called hypothalamic hamartoma (HH), which can induce gelastic seizures—bouts of uncontrolled laughter that can occur at any time, including during sleep. These seizures may be preceded by sensations in the tummy or chest, a headache, or a startled expression.
It is worth noting that sleep laughing is quite common among babies and young children, who spend a larger proportion of their sleep in the REM phase. In most cases, it is a normal part of their development and may even indicate a healthy nervous system and normal brain development.
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It's common in babies and children
Laughing in sleep is usually caused by a strange dream. Sleep partners often describe a chuckling or giggling sound, which tends to wake the dreamer up. Once awake, they may say that the dream was odd or bizarre rather than funny. In most cases, it is both normal and harmless. However, in rare cases, sleep laughter can be linked to neurological conditions.
It is common in babies and children, who laugh in their sleep due to brain stimulations. This usually occurs when they dream of something pleasant. Dreaming and smiling usually occur in the rapid eye movement (REM) stage of sleep. Since babies tend to sleep more than 16 hours a day, most of their sleep is REM sleep. This is why babies and children experience dreams that lead to laughing, smiling, and giggling more frequently.
Babies may also smile or laugh in their sleep due to a reflex, which is not related to any emotional response. This is known as an "endogenous smile" and occurs in newborns, not as a result of external stimulation. It is a manifestation of endogenously determined physiological rhythms during the REM state of sleep.
There is also evidence that laughter during sleep could be a sign of a healthy nervous system and normal brain development in babies. Laughter is part of the process in which the brain processes emotions and experiences. Therefore, it is usually a good sign when babies laugh in their sleep.
While laughing in sleep is usually harmless, in rare cases it might signal a neurological condition that causes bouts of uncontrollable laughter throughout the day. One such condition is hypothalamic hamartoma (HH), which causes gelastic seizures—bouts of uncontrolled laughter or giggling that can happen many times per day, lasting around 10–20 seconds.
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Frequently asked questions
The most common cause of laughing in one's sleep is having a strange dream. Sleep partners often describe a chuckling or giggling sound, which tends to wake the dreamer up. Once awake, they may say that the dream was odd or bizarre rather than funny.
Sleep laughing is perfectly normal and harmless in most cases. However, in rare instances, it could be linked to neurological conditions such as REM sleep behaviour disorder (RBD) or hypothalamic hamartoma (HH).
Sleep laughing could be a symptom of a sleep disorder like RBD, where people act out their dreams with physical movements. Less than 1% of people have RBD, but it tends to affect older males, especially those with neurological conditions. Hypnogely, or sleep laughing, can also be caused by HH, which results in gelastic seizures or bouts of uncontrolled laughter.
Babies often smile and laugh in their sleep, which is usually considered a reflex or part of their development. They may be experiencing dream-like activity, but it is unclear as babies under six months likely don't dream. In most cases, it is not a cause for concern and is common in healthy newborns.
