Down Syndrome and Sleep: A Canadian Parent’s Guide

Sleep that needs a different starting point

If your child has Down syndrome and sleep has been a long, hard struggle, there is something important to know before any sleep advice: for children with Down syndrome, sleep difficulties are common, and they very often have a medical root that no behavioural strategy can fix.

That isn’t discouraging — it’s the opposite. It means that for many of these families, the path to better sleep starts not with a new bedtime routine but with the right medical assessment. Get the order right, and the behavioural work that follows actually has a chance to land.

This guide explains why sleep is harder with Down syndrome, the issue that must be ruled out first, and how support is built from there.

Why sleep is harder with Down syndrome

Children with Down syndrome experience sleep problems at much higher rates than typically-developing children. The reasons are a combination of physical, neurological, and sensory factors:

• Airway and muscle-tone differences. Low muscle tone (hypotonia), differences in mid-face and upper-airway anatomy, a relatively larger tongue in a smaller oral space, and a higher likelihood of enlarged tonsils and adenoids all affect breathing during sleep.
• A higher rate of restless, fragmented sleep, with more night waking.
• Sensory processing differences, which are common in Down syndrome and make settling and staying asleep harder.
• Behavioural settling difficulties, layered on top of all of the above.

The single most important of these — the one that changes everything else — is the airway.

Obstructive sleep apnea: the issue to rule out first

Obstructive sleep apnea (OSA) is the headline sleep concern in Down syndrome. Because of the airway and muscle-tone factors above, OSA is very common in children with Down syndrome — far more common than in the general population.

OSA means the airway is partly or fully blocked during sleep, so the child’s sleep is repeatedly interrupted by the body’s effort to breathe. A child with untreated OSA can sleep ten hours and still be exhausted — because the sleep itself was broken all night.

Signs that can point to OSA include snoring, pauses or gasping in breathing during sleep, very restless sleep, unusual sleep positions (such as sleeping sitting up or with the neck extended), mouth breathing, sweating during sleep, and daytime tiredness or behavioural and attention changes.

Here is the critical part: OSA cannot be reliably detected by watching your child sleep. Parents — and even experienced clinicians — under-detect it. A child can have significant OSA without dramatic, obvious symptoms. This is why OSA can’t be ruled out by observation alone.

Why a sleep study matters

Because OSA is both so common and so easily missed in children with Down syndrome, paediatric guidance generally recommends that children with Down syndrome have a formal sleep study (polysomnography) — often by around age four, and sooner if there are symptoms — even when nothing obvious seems wrong.

A sleep study is the tool that actually answers the airway question. If your child with Down syndrome has not had one, that is a specific, concrete thing to raise with your paediatrician or care team. Treating an airway problem — which may involve ENT assessment and, depending on the cause, treatment of enlarged tonsils and adenoids or other approaches — can transform a child’s sleep in a way no bedtime routine ever could.

This is not something to diagnose or manage at home. It is a conversation to have, and a question to keep asking until it’s answered.

The other sleep challenges

Once the airway has been properly assessed, other contributors can be addressed:

Restless, fragmented sleep. Even without OSA, many children with Down syndrome have more broken sleep. A medical review can check for other contributors.

Sensory processing differences. Sensitivities to texture, sound, light, and touch are common and make both falling asleep and staying asleep harder. (See Sensory Processing and Sleep for how to work with this.)

Behavioural settling difficulties. Difficulty self-settling, bedtime resistance, and night waking are real — but they are best addressed after medical causes have been assessed, not instead of that step.

Medical first, behavioural second — the order that matters

This is the single most important idea in this guide. For a child with Down syndrome, sleep support has a required order:

First, the medical assessment — especially the airway and OSA question, through your paediatrician, your child’s care team, and a sleep study where recommended. You cannot behaviourally train a child into good sleep if their body is being woken all night because it can’t breathe well.

Then, the behavioural and environmental work — built on whatever the medical picture turns out to be.

Step	What it covers
First — medical assessment	The airway and OSA question, through your paediatrician, your child’s care team, and a sleep study where recommended.
Then — behavioural and environmental work	Built on whatever the medical picture turns out to be.

Families who skip the first step and pour their energy into bedtime routines often spend months frustrated, blaming themselves or their child, when the real issue was never behavioural at all. Getting the order right is what protects your effort.

Behavioural sleep support, after medical clearance

Once the medical side has been assessed and addressed, the supportive work matters and helps. The principles are the same ones that underpin all special-needs sleep support:

• A consistent, predictable bedtime routine — calm, unhurried, the same sequence every night. Predictability is regulating.
• A sensory-considered sleep environment — dark, quiet or with white noise, comfortable temperature, and bedding and sleepwear in textures your child tolerates.
• A longer wind-down than typical sleep advice assumes — time for the nervous system to downshift.
• Consistency across caregivers — everyone settling your child the same way.
• Working with your team — your paediatrician, and where involved, occupational therapists and other specialists, so the sleep plan fits the whole child.

This is steady, patient work — and it is far more effective when it sits on top of a sound medical foundation.

Frequently asked questions

Sources

• Canadian Paediatric Society (2025). Sleep matters: the importance of sleep for children and youth with neurodevelopmental disabilities. Position statement. cps.ca
• Bull MJ, et al. / American Academy of Pediatrics (2022). Health Supervision for Children and Adolescents With Down Syndrome. Pediatrics 149(5):e2022057010. PubMed
• Maris M, et al. (2016). Obstructive sleep apnea prevalence in children with Down syndrome (polysomnography cohort). SLEEP. PMC
• Shott SR, et al. (2006). Obstructive sleep apnea: should all children with Down syndrome be tested? Arch Otolaryngol Head Neck Surg. PubMed
• Esbensen AJ, et al. (2016). Sleep and cognition in children with Down syndrome (citing the AAP clinical report on sleep-study referral by age 4). J Dev Behav Pediatr. PMC
• National Down Syndrome Society (2024). Sleep & Down syndrome (advocacy resource). ndss.org

This is general education, not medical advice. Talk to your child’s doctor or care team about a sleep study.