Miya Pearson
It is relatively common for babies to giggle in their sleep, and it is usually nothing to worry about. However, in rare cases, it can be a sign of a neurological issue or a sleep disorder. Newborns spend about 50% of their time in REM sleep, a phase linked with dreaming in adults, and it is during this phase that they are most likely to smile and laugh. As babies grow and develop, laughter is one way they can practice and perfect control over their bodies and emotions.
| Characteristics | Values |
|---|---|
| How common is it? | Laughing in sleep is a relatively common occurrence in babies. |
| Is it normal? | In most cases, sleep-laughing is harmless and is a normal part of a baby's development. |
| Is it a cause for concern? | While rare, laughing during sleep can sometimes indicate a neurological issue, such as REM sleep behaviour disorder, epilepsy, Tourette's syndrome, or autism spectrum disorder. |
| What can parents do? | If parents are concerned about their baby's health or well-being, they should contact a healthcare provider. |
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What You'll Learn
- Laughing in sleep, or hypnogely, is generally harmless
- Babies experience REM sleep 50% of the time, which is linked with dreaming in adults
- Babies sleep differently from adults, in short cycles alternating between active and quiet periods
- Laughing in sleep could be a sign of a rare seizure called a gelastic seizure
- Sleep-laughing is usually not a cause for concern but can occasionally indicate an underlying health problem
Laughing in sleep, or hypnogely, is generally harmless
Laughing in sleep, or hypnogely, is a relatively common occurrence in newborns and generally harmless. It is often seen as a precursor to their first real smile and laugh, which typically occur around 2 and 6 months, respectively. As babies grow and gain control over their bodies and emotions, laughter becomes a way for them to practice and perfect this control. This is especially true if they are trying to wake you up or signal that they are hungry. For instance, they might laugh after passing gas.
In most cases, sleep-laughing is not something to worry about and is a normal part of a baby's development. Newborns spend about 50% of their time in REM sleep, a phase linked with dreaming in adults. While the exact nature of infants' dreams remains uncertain, one small study found that babies tend to smile during REM sleep, indicating that smiling during sleep is common in healthy newborns.
However, there are rare instances where laughing during sleep could indicate a more serious issue. For example, uncontrollable laughing fits could be a sign of gelastic seizures, a rare type of seizure. Additionally, laughter during sleep can be associated with REM sleep behavior disorder, in which the paralysis of limbs does not occur, leading to physical acting out of dreams. This disorder may be linked to other conditions such as Lewy body dementia and Parkinson's disease.
Other sleep disorders that can cause laughter during sleep include non-REM sleep arousal parasomnias, such as sleepwalking and sleep terrors, which are more common in children but can also occur in adults. In babies, neurodevelopmental disorders like autism spectrum disorder could be a factor in sleep-laughing. While these disorders are rare, it is important to be aware of them and consult a healthcare provider if you have any concerns about your baby's health or well-being.
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Babies experience REM sleep 50% of the time, which is linked with dreaming in adults
Newborns and adults have very different sleep cycles. While adults experience REM sleep after about 90 minutes of sleep, newborns enter REM sleep immediately after falling asleep. They spend about 50% of their sleep time in this stage, which is linked with dreaming in adults.
REM sleep is an active sleep stage in which a newborn's eyes can move underneath their eyelids. They may also twitch or jerk their arms and legs. This sleep stage is important for a baby's development. During REM sleep, neural connections go into overdrive, aiding in brain development and emotional well-being. It also helps with memory consolidation, learning, and overall cognitive development.
As babies grow older, they experience fewer REM sleep cycles and more non-REM sleep cycles. Non-REM sleep is the initial stage of sleep, consisting of four substages: NREM-1, NREM-2, NREM-3, and NREM-4. Each substage has its characteristics and is vital for physical restoration and growth.
While laughing in your sleep as a baby is generally harmless, in rare instances, it can be a sign of a neurological issue or REM sleep behaviour disorder. This is when the paralysis of your limbs doesn't occur during REM sleep, and you act out your dreams physically. However, for babies and young children, laughing in their sleep is typical and not usually a cause for concern.
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Babies sleep differently from adults, in short cycles alternating between active and quiet periods
It is not uncommon for babies to giggle in their sleep. This occurrence is called hypnogely and is generally harmless. However, in rare instances, it can be a sign of a neurological issue, such as REM sleep behaviour disorder, epilepsy, or Tourette's syndrome. In the case of REM sleep behaviour disorder, the individual acts out their dreams physically, sometimes even waking up during the dream and remembering it. This disorder is associated with other disorders, including Lewy body dementia and Parkinson's disease.
Babies sleep differently from adults. During the first few months of life, they sleep in short cycles, alternating between active and quiet periods. Their eyes may flutter, and their arms and legs may twitch during these active periods, but this is normal. Newborns sleep a lot—up to 17 hours a day—but they cannot stay asleep for long periods. Typically, they sleep for only 2-3 hours at a time before they need to eat again.
Babies likely experience dream-like activity during sleep. Newborns spend about 50% of their time in REM sleep, which is linked with dreaming in adults. However, the exact nature of infants' dreams remains uncertain, as their cognitive and emotional experiences differ significantly from those of adults. One small study found that babies tend to smile during active sleep or REM sleep. It also found that smiling during sleep is common in healthy newborns.
As babies grow and develop, they start to gain control over their bodies and emotions. Laughter is one way they can practice and perfect this control. This is most likely to happen if your baby tries to wake you up or signal that they're hungry. Maybe they've just passed gas, and they're proud of themselves! In most cases, sleep-laughing is nothing to worry about. It's a normal part of your baby's development and doesn't usually indicate any underlying health problems.
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Laughing in sleep could be a sign of a rare seizure called a gelastic seizure
While laughing in sleep is generally harmless and a common occurrence in babies, it could be a sign of a rare seizure called a gelastic seizure. Gelastic seizures are a form of partial seizure that causes uncontrollable laughter or smiling. They are often brief, lasting less than 30 seconds to a few minutes, and can occur as an individual is falling asleep or throughout the night, waking the person. They can be subtle and are commonly mistaken for other conditions, especially during early infancy.
Gelastic seizures are the most specific symptom associated with hypothalamic hamartomas (HH), which is an abnormality present at birth. They are caused by atypical electrical-chemical activity within the hypothalamus, an area at the base of the brain. The laughter during a gelastic seizure is often different from an individual's true laughter, and they may not experience happy feelings. Some individuals may have unusual sensations in their stomach before or during a gelastic seizure, which can lead to an incorrect diagnosis of gastrointestinal distress. Visual and auditory disturbances may also occur, ranging from distorted vision to hallucinations.
Gelastic seizures can be unpleasant and scary for those who experience them, and individuals may look panicked or stare during an episode. They are often aware of their surroundings and what is happening, and most family members can distinguish a gelastic seizure from true laughter. However, they may be challenging to diagnose, as they originate deep within the brain and may not be detected by routine EEG tests.
If you are concerned about your baby's health or well-being, it is important to contact their healthcare provider. While gelastic seizures are rare, occurring in only 0.005% of people, they can progress to other types of seizures, and treatment may improve the outlook.
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Sleep-laughing is usually not a cause for concern but can occasionally indicate an underlying health problem
Sleep-laughing is a relatively common occurrence in babies, and it usually doesn't indicate anything serious. In fact, it's often a harmless and adorable part of their development, sending parents into a frenzy as they try to capture these moments in their baby books!
However, there are rare instances where sleep-laughing could be a symptom of an underlying health issue. One such example is gelastic seizures, which are characterised by uncontrollable laughing fits as the baby is falling asleep. These seizures are exceptionally rare, affecting only 0.005% of people. Another potential concern is REM sleep behaviour disorder, where the usual paralysis of the limbs during REM sleep does not occur, leading to physical acting out of dreams. This disorder is associated with other serious conditions, including Lewy body dementia and Parkinson's disease. Additionally, sleep-laughing could be related to non-REM sleep arousal parasomnias, which are a hybrid state of being half-asleep and half-awake. These episodes are typically short, lasting less than an hour, and include behaviours such as sleepwalking and sleep terrors.
Neurological disorders affecting the part of the brain that controls emotions can also manifest as sleep-laughing. While these disorders are rare, they are important to be aware of. For instance, in babies, neurodevelopmental disorders like autism spectrum disorder could be a factor. It's worth noting that the central nervous system is not fully developed at this early stage, making it challenging to determine if sleep-laughing is a typical occurrence or indicative of a disorder.
If you're concerned about your baby's sleep-laughing or if it's causing sleep disturbances, it's always best to consult a healthcare professional. They can provide guidance, address any worries, and refer you to a sleep specialist if needed.
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Frequently asked questions
Yes, it is relatively common for newborns to giggle in their sleep. It is likely a reflex and a part of normal development.
Scientists are not sure why newborns giggle in their sleep. However, one theory suggests that newborns experience dream-like activity during sleep. Newborns spend about 50% of their time in REM sleep, which is linked with dreaming in adults.
In most cases, newborn sleep-giggling is harmless and not a cause for concern. However, if accompanied by abnormal behaviour, it could indicate a rare neurological issue such as REM sleep behaviour disorder, gelastic seizures, or other parasomnias.
Signs of gelastic seizures include laughter as the baby is falling asleep, being woken up from sleep by laughter, and then falling back asleep. If you are concerned about your baby's health, contact a healthcare provider.
While there is no need to worry about sleep-giggling in most cases, you can help your baby sleep by maintaining a cool and comfortable environment, keeping the lights dimmed, and reducing noise.
