
It is common for babies and toddlers to kick and move around in their sleep. This is often due to the Moro reflex, which is related to their immature nervous system. Babies also spend a lot of time in a sleep phase called active sleep, which is part of their natural sleep cycle and differs from adult sleep. During active sleep, babies are more likely to move, twitch, kick, and make noises. While it is usually nothing to worry about, in some cases, it could be a sign of Pediatric Periodic Limb Movement Disorder (PLMD) or Pediatric Restless Leg Syndrome (RLS). If you are concerned about your child's sleep habits or notice unusual movements, it is recommended to consult a healthcare professional for personalized advice and guidance.
| Characteristics | Values |
|---|---|
| Normal behaviour | Kicking and twitching are normal for babies and toddlers |
| Sleep starts | Quick jerks of the arms and legs as your child falls asleep |
| Active sleep | Sleep phase where the brain is active, essential for growth and development |
| Moro reflex | Unintentional movements due to an immature nervous system |
| Nightmares | Can cause disturbed sleep |
| Pediatric Periodic Limb Movement Disorder (PLMD) | Rare condition causing repeated leg jerks during sleep |
| Restless Leg Syndrome (RLS) | Uncontrollable need to move legs, can occur during sleep or when awake |
| Temperature | Being too warm or cold may cause restlessness |
| Sleep environment | A night light may help |
| Bed height | A low bed can prevent injury from falling |
| Sleep habits | Consistent bedtime and wake-up time, healthy breakfast, exposure to natural light, physical activity, avoiding caffeine |
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What You'll Learn

It's normal for toddlers to kick in their sleep
It is completely normal for toddlers to kick in their sleep. Babies and toddlers tend to move around a lot when they sleep, and this doesn't necessarily mean that they are poor sleepers or that something is wrong. In fact, up to 70% of children and adults experience "sleep starts", which are quick jerks of the arms and legs that happen as they fall asleep.
The Moro reflex, or startle reflex, is common in newborns and can cause them to jerk and kick during sleep. This is related to their immature nervous system, which also means they have less control over their reflexes. Babies also spend a lot of time in a sleep phase called "active sleep", which is part of their natural sleep cycle and is characterised by more movement, twitching, kicking, and vocalisations. This phase of active sleep is essential for their growth and development.
Toddlers may also kick in their sleep due to nightmares, which can start as young as 6 months old but typically show up closer to age 2. In rare cases, toddlers may have Pediatric Restless Leg Syndrome or Pediatric Periodic Limb Movement Disorder (PLMD), which can cause excessive kicking and leg movements during sleep. If you are concerned about your toddler's kicking, you can try improving their sleep hygiene by using white noise or other soothing sounds to block out disruptive environmental noises.
While it is normal for toddlers to kick in their sleep, it is important to ensure that they are getting enough sleep. Daytime habits can improve your toddler's sleep at night, such as giving them a healthy breakfast, encouraging physical activity during the day, and providing a satisfying evening meal at a reasonable time. You can also encourage your toddler to avoid caffeine and get enough natural light, especially in the morning, to regulate their internal body clock.
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Pediatric Periodic Limb Movement Disorder (PLMD)
- Periodic limb movement during sleep (PLMS) documented by polysomnography
- PLMS exceeding norms for age (more than 5 times per hour for children)
- Clinical sleep disturbance or daytime fatigue
- The absence of another primary sleep disorder or reason for the PLMS, including Restless Leg Syndrome (RLS) and Obstructive Sleep Apnea (OSA)
PLMD commonly co-occurs with RLS but may also appear independently. PLMS are brief repetitive movements or jerks, lasting on average 2 seconds and occurring every 5 to 90 seconds during the first two stages of sleep. PLMD occurs when PLMS are associated with frequent, but brief, arousals from sleep.
PLMD has been reported in children and is more prevalent in certain conditions such as attention deficit hyperactivity disorder (ADHD). The International Restless Legs Syndrome Group has recently developed the criteria for diagnosis of PLMD in children. These criteria include both specific clinical features and polysomnographic findings. Exclusion of other causes, especially sleep-disordered breathing, is essential. Several medications, including benzodiazepine and dopaminergic medication, have been used in children, although these medications have not been adequately studied in this age group. Some PLMD children have evidence of low iron storage and respond favourably to iron therapy. Treatment primarily involves iron supplementation, with behavioural interventions and off-label pharmacological options considered in more severe cases.
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Restless Leg Syndrome (RLS)
It is quite common for toddlers to move around in their sleep. This could be due to various reasons, including dreaming, nightmares, or the Moro reflex, which is related to their immature nervous system. In most cases, this is perfectly normal and not a cause for concern.
However, if you are concerned about your child's sleep patterns, it is always recommended to consult a healthcare professional. One possible explanation for your child's kicking during sleep could be Restless Leg Syndrome (RLS). RLS is a condition that causes a strong urge to move the legs, often accompanied by uncomfortable sensations in the legs. These sensations are typically worsened by rest and relieved by movement. While RLS is more commonly associated with adults, it can also occur in children, albeit rarely.
The exact causes of RLS are not fully understood, but it is believed to be related to dopamine, a chemical in the brain that helps control motion. Low levels of dopamine have been linked to RLS. Additionally, iron deficiency has been associated with RLS, as iron plays a crucial role in brain dopamine function. Blood tests to measure iron levels are often ordered for patients suspected of having RLS.
The symptoms of RLS can vary in severity and frequency. Some children may experience the sensations more during the day than at night. In some cases, RLS can cause involuntary leg movements during sleep, known as Periodic Limb Movement Disorder (PLMD). These movements can range from subtle jerks to more pronounced thrashing, and they may or may not disturb the child's sleep. PLMD is often associated with RLS, but it can also occur independently.
If you suspect that your child may have RLS, it is important to seek medical advice. A healthcare professional can evaluate your child's symptoms, conduct appropriate tests, and recommend treatment options if needed. While RLS can be a frustrating condition, proper management can help improve your child's sleep and overall well-being.
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The Moro Reflex
In older infants, children, or adults, the presence of the Moro reflex is abnormal and may indicate underlying issues. A hyperactive Moro reflex is commonly associated with neonatal withdrawal from maternal drug abuse, including opioids and heroin. Attention-deficit hyperactivity disorder (ADHD) has also been linked to a persistent Moro reflex in school-aged children.
While the Moro reflex is typically associated with newborns and infants, it is worth noting that toddlers and young children may also exhibit restless sleep behaviours, such as kicking and hitting, as described in some of the provided sources. However, these behaviours are generally considered typical and not necessarily indicative of an underlying issue. Ensuring a consistent sleep routine, providing a night light, and adjusting the child's temperature can help improve sleep habits.
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Nightmares
It is common for toddlers to experience nightmares. While the exact cause of nightmares is unknown, they are often triggered by stress and anxiety. For example, a scary-looking spider, a fight with a friend, or changes in routine or family dynamics can cause nightmares in toddlers. Toddlers may also be more likely to experience nightmares when they are overtired.
If your 2-year-old is kicking in their sleep, it could be due to nightmares or night terrors. Night terrors are more common in children between the ages of 3 and 7, but they can occur earlier. During a night terror, a child may scream, thrash around, or cry inconsolably, and it can be challenging to calm them down. On the other hand, nightmares typically occur when children are overtired or stressed, and they may wake up crying or frightened and have difficulty falling back asleep.
If your toddler is experiencing nightmares, there are several things you can do to help:
- Offer comfort: When your child wakes up from a nightmare, offer a comforting touch, such as a back or belly rub, and speak to them in a soft, gentle voice. If they don't settle down, try turning on a dim light and continue to offer reassurance.
- Encourage expression: Toddlers may have difficulty communicating their feelings, but it is important to allow them to express themselves. Even if they can't explain what they're fearful of, simply listening and keeping the lines of communication open can be comforting.
- Establish a calming bedtime routine: A consistent bedtime routine can help ease stress and anxiety that may contribute to nightmares. Avoid scary books or stories before bed, and consider providing a cheerful night-light or leaving the bedroom door ajar.
- Address fears: Toddlers often develop fears as their imagination blossoms. Talk to your child about any fears they may have, such as monsters or the dark, and offer reassurance.
- Maintain a healthy sleep schedule: Ensure your toddler is getting enough sleep and stick to a consistent sleep schedule. Limit daytime naps to 2-3 hours and allow 5-6 hours of awake time between their last nap and bedtime.
- Avoid heavy meals or snacks before bed: Eating a large meal or snacking too close to bedtime can activate your toddler's metabolism and brain, potentially leading to more nightmares.
- Reduce screen time and caffeine intake: Limit your toddler's exposure to screens and devices before bed, and avoid caffeine, including chocolate, to promote better sleep.
While it is normal for toddlers to kick in their sleep occasionally, if you are concerned about the frequency or intensity of their nightmares or sleep behaviour, consider consulting a healthcare professional for personalised advice.
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Frequently asked questions
It is completely normal for toddlers to move around and kick in their sleep. This could be due to the Moro reflex, active dream states, or nightmares.
You could try adjusting the temperature of their sleeping environment to see if they are less mobile when warmer or colder. You could also try swaddling your toddler, which has been shown to reduce kicking and improve sleep.
If your toddler's kicking is causing them to wake up frequently, or if they are having difficulty staying asleep, this could be a sign of Pediatric Periodic Limb Movement Disorder (PLMD) or Pediatric Restless Leg Syndrome (RLS). Other signs include stronger motions that wake your toddler up from sleep, or if the kicking is accompanied by tossing and turning.
If you are concerned about your toddler's kicking, you should consult your paediatrician or GP. They will be able to advise you on the best course of action and recommend any necessary treatment.











































