Autism and sleep in kids: do autistic babies and toddlers sleep less?

Any baby and child may struggle to sleep well from time to time, especially in early infancy. However, for neurodivergent and autistic individuals, sleep problems are more common. In this post we’ll discuss some of the most common sleep differences experienced by autistic children and their families.

Why Autistic Kids May Have Sleep Problems

Autistic children are more likely to have sleep issues. What’s happening physiologically?

1. Sleep architecture is different in many autistic individuals. Research shows differences in both the quantity and quality of sleep:

• Reduced slow-wave (deep) sleep: This is the most restorative stage of sleep, and it helps consolidate memory and support physical recovery. A reduction in this stage may result in lighter, more fragmented sleep overall.
• Less REM sleep: REM is crucial for emotional processing, learning, and integration. Less REM can also contribute to more frequent waking because the brain isn’t achieving a complete sleep cycle.
• Shorter sleep cycles and more transitions between stages: This means autistic children may reach lighter stages of sleep more frequently—where it’s easier to fully wake.

2. Circadian rhythm and genetic dysregulation. Emerging research suggests that in some autistic individuals, the biological clock that governs sleep-wake cycles—known as the circadian rhythm—may function differently at the genetic level.

Our circadian rhythm is regulated by a complex network of genes—often called clock genes—which control the body’s internal timing system. These genes influence the production and release of key hormones like melatonin and cortisol, which help the brain know when it’s time to sleep, stay asleep, and wake.

In autistic children, several studies have found altered expression of these clock genes, meaning the genetic signals that regulate sleep and wake timing may be out of sync. For example:

• The brain may begin releasing melatonin too late in the evening—or not in sufficient amounts—which can delay both sleep onset and the ability to stay asleep through the night.
• Cortisol levels, which should drop at night to allow the body to rest, may remain elevated for longer than expected, keeping the child in a more alert or activated state.
• These circadian disruptions don’t just delay sleep—they can fragment it, making it harder for the body to maintain continuous, consolidated rest.

This kind of internal misalignment means that even with a consistent bedtime routine and optimal sleep hygiene, the child’s body might simply not be biologically ready to sleep—or may keep waking throughout the night due to poor synchronization between brain and body.

3. Hormonal and neurochemical differences:

• Melatonin: Studies show that some autistic individuals produce melatonin at different times (delayed onset), in lower quantities, or with a disrupted circadian rhythm. Disruption here can lead to early night sleep followed by waking and an inability to resettle.
• Cortisol: Elevated nighttime cortisol levels have been found in some autistic children. Cortisol ideally lowers at night to allow for rest—but when it’s elevated, the body may remain in a state of alertness even during sleep periods, leading to nighttime waking and difficulty returning to sleep.

In practice, this means:

A child may wake 3, 4, even 5 times a night—not because they “don’t know how to sleep,” but because their nervous system is constantly surfacing into lighter sleep, reacting to sensory input, or failing to maintain hormonal conditions for sustained rest. 

Standard advice to “leave them alone so they learn to self-soothe” can be ineffective or even harmful—because the root of the waking isn’t behavioral, it’s biological. Gentle co-regulation, sensory support, and consistency can go a long way—but we need to adjust our expectations of what sleep looks like for neurodivergent kids.

Parents may notice:

• Your child may wake in the middle of the night for long periods.
• They may appear “alert” or even ready to play—not because they’re well-rested, but because their nervous system is struggling to downshift again.
• Standard advice like “don’t go in or you’ll reinforce the waking” can backfire. Often, neurodivergent children need support to co-regulate back into rest—even if they’re not crying or upset.

 

Frequent Night Waking in Autistic Children

Frequent or prolonged night waking is one of the most common and persistent sleep challenges in autistic children—and it’s often misunderstood as behavioral or habit-based. In reality, it’s rooted in neurobiological, sensory, and hormonal differences. This is due to:

1. Sleep Architecture Differences

Autistic children often experience disruptions in typical sleep stages:

• Less slow-wave (deep) sleep: This stage is the most restorative and protective against waking. When there’s less of it, sleep becomes lighter and more fragmented.
• Shorter sleep cycles: Typical sleep cycles last about 90 minutes. In some autistic children, cycles may be shorter, increasing the number of transitions through lighter stages of sleep—where waking is more likely.
• Less REM sleep: REM sleep is important for memory and emotional processing. Disruptions here may lead to more awakenings and less restorative rest.

These differences in structure make it more likely that a child will naturally surface into lighter sleep—and without the right sensory or regulatory support, they may fully wake.

2. Sensory Processing Differences

Autistic children often have heightened sensory sensitivity. That means:

• A small noise, a shift in temperature, or the feeling of twisted sheets might be enough to trigger a full awakening.
• The ability to filter out background stimuli (sensory gating) is reduced, so even subtle sensory input can keep the nervous system alert.
• Once awake, the child may have a harder time resettling without specific sensory or regulatory input.

The sleep environment may need to be highly individualized—what feels calming to one child may feel overstimulating to another.

Why this isn’t the same as a “split night”:

In typical development, a split night is often caused by developmental leaps or a timing issue (undertiredness or too much daytime sleep, or overtiredness)—resulting in a child waking in the middle of the night, fully alert, as part of a circadian rhythm imbalance.

In contrast, nocturnal awakenings in autistic children are rarely behavioral or due to scheduling missteps. They’re usually the result of neurological and physiological differences in how the body cycles through sleep, processes stimulation, or manages arousal during the night.

Bedtime Struggles

Parents of autistic and neurodivergent children often report having a very hard time at bedtime. This is for several reasons:

1. Stimming and Repetitive Movements at Bedtime

Many neurodivergent toddlers engage in stimming or repetitive movements as a way to regulate their nervous systems. These can look like body rocking, head shaking, hand flapping, vocalizing, or tapping—and they often increase in moments of transition, stress, or sensory overload. At bedtime, this can get complicated.

For some children, these movements help them wind down. They are soothing, rhythmic, and grounding—part of how the body finds safety and regulation after a full day of sensory input. But for others, especially those who are overtired or dysregulated, stimming can actually become activating—intensifying the nervous system’s arousal state and making it harder to fall asleep.

In other words, the movement is meant to regulate, but the child is too dysregulated for it to actually work—so they keep stimming, getting more and more stuck in that alert state, and sleep feels impossible.

Important note:

We don’t want to stop stimming altogether (unless the stim is unsafe). Stimming is a legitimate form of self-regulation and communication. The goal isn’t to suppress the behavior, but to understand the need underneath it. However, when it interferes with sleep, we may need to support the child in a different way to help shift the nervous system from “on” to “off.”

This might look like:

• Providing deep pressure or rhythmic touch to replace or support the movement.
• Offering a calming sensory tool (like a chewy, weighted object, or a compression sheet). Often times a thick smoothie through a narrow straw can help. 
• Creating a predictable, slow-moving bedtime routine that gives space for movement earlier in the wind-down process—so that the need is met before the sleep transition begins.

2. Longer Sleep Onset in Neurodivergent Children

Autistic children often experience longer sleep latency—meaning it takes them more time to fall asleep once in bed. This can be rooted in several key differences in how their nervous systems function:

Heightened Sensory Sensitivity: Autistic children often experience sensory input more intensely. The feel of the sheets, the hum of a white noise machine, or the dim light peeking under the door might be overwhelming, making it difficult to shift into a calm, sleep-ready state. Sensory gating—the brain’s ability to filter out unnecessary stimuli—can be less efficient, meaning background input continues to activate the nervous system.

Difficulty Transitioning Between States: Transitions are neurologically more demanding for many neurodivergent children. Moving from a state of play or connection into stillness and solitude is a big leap. It requires cognitive flexibility and regulation—both of which can be slower to develop or harder to access when dysregulated.

Nervous System Arousal: Many neurodivergent children live in a state of heightened nervous system arousal. Their bodies may stay in “alert mode” longer than expected, especially after a stimulating day or an environment that didn’t fully support regulation. Falling asleep requires a shift into parasympathetic (rest-and-digest) dominance—something that doesn’t happen easily when the nervous system feels even slightly unsafe or dysregulated.

Because of this, longer sleep latency can easily trip parents up. A child might look like they aren’t tired yet, so parents extend wake windows, hoping for more “sleep pressure.” But what’s really happening is that the child is tired—they just take longer to transition into sleep. Extending wake windows in this case can backfire and lead to overtiredness, making sleep even harder.

Parents may also give up after 20 or 30 minutes of trying, assuming it’s not working. But for some neurodivergent children, 40+ minutes is completely normal for their nervous system to shift into a state that allows sleep to come.

3. Connection at Bedtime Looks Different for Neurodivergent Kids

For all children, sleep is a vulnerable state—so the ability to fall asleep is deeply tied to feeling safe, regulated, and connected. This is especially true for neurodivergent children, whose nervous systems often rely more heavily on co-regulation and predictability to transition into rest.

But here’s the important take-away: connection doesn’t always look the way we expect it to.

Many parents use bedtime as a bonding moment through things like snuggling, reading books, or singing lullabies. And for some children, that works beautifully. But for many autistic children, that kind of connection isn’t how they experience closeness—and forcing it can actually creates disconnection.

Autistic connection is often different.

Some neurodivergent children may seek connection at bedtime by:

• Talking about a special interest in detail (even if it seems off-topic or overly energetic).
• Repeating phrases or engaging in echolalia.
• Engaging in parallel play or shared sensory activities.
• Requesting movement or stimming next to or near a caregiver, without direct eye contact or physical closeness.

This can feel counterintuitive for parents who expect connection to look more neurotypical—like cuddling, sustained eye contact, or soft verbal exchanges. But in reality, the child is connecting in the way their nervous system and brain are wired to.

What’s happening neurologically:

The autistic brain processes social and sensory input differently. For many neurodivergent children, predictable, interest-based engagement is what feels safe—not ambiguous or emotionally expressive interactions, which can be confusing or overwhelming. The vagus nerve—which plays a key role in the body’s ability to shift into a restful parasympathetic state—is most effectively activated when the child feels attuned with in a way that they perceive as safe. That might mean scripting lines from a favorite show or talking about dinosaurs in detail.

So what does this mean for parents?

• Let go of the idea that connection has to look a certain way.
• Follow your child’s lead, even if their rituals don’t feel “sleepy.”
• Honor their bids for connection, even when they come in the form of movement, repetition, or info-dumping.

 

True Sleep Disorders in Autistic Children

While many sleep challenges in autistic children stem from differences in sensory processing, nervous system regulation, or circadian rhythm—there are also clinically recognized sleep disorders that occur more frequently in this population. We often discuss sleep “red flags” or symptoms besides the frequent wakings that may indicate a sleep disorder.

1. Insomnia Disorder

This is by far the most common sleep disorder in autistic children. It involves persistent difficulty falling asleep, staying asleep, or waking too early—and it’s not explained by a lack of opportunity or poor sleep hygiene.

• Many autistic children experience sleep-onset insomnia, where it takes 30–60+ minutes to fall asleep even when tired.
• Others may fall asleep initially but wake frequently and struggle to resettle, due to heightened arousal or environmental sensitivities.

This is often driven by differences in melatonin production, elevated nighttime cortisol, and difficulties regulating arousal states.

2. Circadian Rhythm Sleep-Wake Disorders

This occurs when a child’s internal body clock is significantly out of sync with the external day-night cycle.

• The most common subtype in autistic children is Delayed Sleep Phase Syndrome (DSPS), where the child’s natural sleep drive doesn’t kick in until very late at night.
• These children are often described as “night owls” from infancy—and efforts to force earlier sleep times often fail or lead to bedtime battles.

This is often linked to dysregulation in clock genes and abnormal melatonin timing.

3. Obstructive Sleep Apnea (OSA)

OSA is more common in autistic children than in neurotypical peers, especially in those with low muscle tone, craniofacial differences, enlarged tonsils/adenoids, or oral motor dysfunction (including tongue ties or high palates).

• Children with OSA experience pauses in breathing during sleep, leading to fragmented, poor-quality rest and often increased nighttime waking.
• Signs may include snoring, mouth breathing, gasping, sweating, restless sleep, or daytime fatigue despite adequate sleep hours.

It’s important to note that many autistic children may not present in the “typical” way, and sleep studies (polysomnography) may be needed to uncover the issue.

4. Restless Legs Syndrome (RLS) / Periodic Limb Movement Disorder (PLMD)

These disorders involve uncomfortable sensations in the legs or involuntary limb movements that disrupt sleep.

• They can be harder to identify in autistic children, especially if communication is limited—but you might notice your child thrashing, kicking, or waking frequently without clear explanation.
• These disorders are sometimes linked to iron or dopamine dysregulation, which have also been implicated in autism.

5. Parasomnias

These include sleepwalking, night terrors, and confusional arousals—which occur more frequently in children with neurodevelopmental differences.

• Parasomnias typically occur during transitions between deep and lighter sleep and may be more common due to disrupted sleep architecture in autistic children.
• While usually benign, they can be distressing and contribute to fragmented sleep or increased parental stress.