When I mention paediatric obstructive sleep apnea at dinner parties (which, I’ll admit, isn’t exactly small talk), the most common response is surprise. “Kids get sleep apnea?” They do. Estimates suggest 1-5% of children have obstructive sleep apnea, with prevalence peaking between ages 2-8 — coinciding with the period when adenoid and tonsillar tissue is largest relative to airway size.

But here’s what concerns me most: paediatric OSA is chronically underdiagnosed. The American Academy of Pediatrics estimates that fewer than half of children with clinically significant OSA are identified before the condition causes measurable developmental, behavioural, or cardiovascular consequences.

The reason is simple: children with sleep apnea don’t look like adults with sleep apnea. The presentation is different, the symptoms are different, and the daytime consequences manifest in ways that point clinicians and parents toward completely different diagnoses.

How Paediatric OSA Differs From Adult OSA

Adult sleep apnea is straightforward to suspect: the typical patient is overweight, snores loudly, has witnessed apnoeas (breathing pauses), and reports daytime sleepiness. It’s a recognisable clinical picture.

Children break this pattern in several important ways:

Snoring may be absent. While most children with OSA do snore, up to 20% don’t — or their snoring is mild enough that parents don’t flag it as abnormal. “Light snoring” in a child is often dismissed as congestion, allergies, or just a normal childhood sound.

Daytime sleepiness isn’t the primary symptom. Adults with untreated OSA feel tired. Children with untreated OSA are often hyperactive. The fragmented sleep and intermittent hypoxia that cause fatigue and somnolence in adults produce the opposite behavioural phenotype in children — increased motor activity, impulsivity, inattention, and emotional dysregulation.

This is the single most important thing for parents and clinicians to understand: a child with untreated OSA can look exactly like a child with ADHD.

Body weight is less predictive. In adults, obesity is the strongest risk factor for OSA. In children, the primary risk factor is adenotonsillar hypertrophy — enlarged adenoids and tonsils — which occurs in children of all body weights. While childhood obesity does increase OSA risk, many children with significant OSA are normal weight.

The ADHD Connection

The overlap between paediatric OSA and attention deficit hyperactivity disorder symptoms deserves particular attention, because the misdiagnosis rate is substantial and the treatment implications are dramatically different.

A landmark study published in Pediatrics followed children who were about to undergo adenotonsillectomy for sleep-disordered breathing. Before surgery, approximately 28% of these children met diagnostic criteria for ADHD based on behavioural rating scales. Twelve months after surgery — which resolved the OSA — the proportion meeting ADHD criteria dropped to 11%.

Read that again: nearly two-thirds of the “ADHD” in these children was actually caused by sleep-disordered breathing.

This doesn’t mean ADHD isn’t real or that every child diagnosed with ADHD actually has OSA. It means that sleep-disordered breathing should be systematically excluded before an ADHD diagnosis is made, and it frequently isn’t.

I’ve seen children referred to me after years on stimulant medication for ADHD, whose parents mentioned “oh, they do snore a bit” during the history. Sleep study confirms severe OSA, adenotonsillectomy resolves both the OSA and the behavioural symptoms, and the ADHD medication turns out to have been unnecessary. These cases are simultaneously gratifying and infuriating — gratifying because the treatment works, infuriating because the diagnosis should have been made years earlier.

Signs to Watch For

Parents should be aware of the following symptoms that may indicate paediatric OSA:

During sleep:

• Snoring (any degree, but especially if accompanied by pauses, gasps, or snorts)
• Mouth breathing during sleep
• Restless sleep — frequent position changes, unusual sleeping positions (hyperextending the neck, sleeping sitting up or propped on pillows)
• Sweating during sleep disproportionate to room temperature
• Bedwetting (enuresis) in a child who was previously dry at night — nocturnal enuresis occurs at higher rates in children with OSA and often resolves with OSA treatment

During the day:

• Morning headaches
• Difficulty waking up and morning grogginess
• Hyperactivity, impulsivity, or difficulty concentrating (ADHD-like symptoms)
• Behavioural problems — aggression, mood swings, emotional fragility
• Academic underperformance relative to cognitive ability
• Mouth breathing during the day
• Nasal voice quality
• Difficulty swallowing or picky eating (often due to large tonsils)

No single symptom is diagnostic. But a combination of nighttime breathing disturbances with daytime behavioural or cognitive symptoms should prompt formal evaluation.

Diagnosis

The gold standard for paediatric OSA diagnosis is overnight polysomnography (PSG) in a paediatric sleep laboratory. The scoring criteria are different from adults — in children, an apnoea-hypopnea index (AHI) of 1 or more events per hour is considered abnormal, versus 5 or more in adults. This lower threshold reflects the fact that any degree of sleep-disordered breathing in a developing child can have neurocognitive consequences.

Access to paediatric sleep studies in Australia varies considerably. Metropolitan paediatric hospitals generally offer the service, but wait times can extend to 3-6 months. Regional access is limited — families may need to travel to capital cities for testing. Organisations exploring AI-driven diagnostic tools are working on home-based screening approaches that could help triage children for laboratory testing, though these aren’t yet clinically validated for paediatric use.

The Royal Children’s Hospital Melbourne and Sydney Children’s Hospital both run dedicated paediatric sleep services with multidisciplinary teams including sleep physicians, ENT surgeons, orthodontists, and respiratory physiologists.

Treatment

Adenotonsillectomy is the first-line treatment for paediatric OSA caused by adenotonsillar hypertrophy, which accounts for the majority of cases. The Childhood Adenotonsillectomy Trial (CHAT), published in the New England Journal of Medicine, demonstrated that adenotonsillectomy improved polysomnographic findings, behaviour, quality of life, and symptoms compared with watchful waiting.

Success rates are high — approximately 75-80% of children with uncomplicated OSA achieve normalisation of their AHI after adenotonsillectomy. The remaining 20-25% have residual OSA, often due to additional contributing factors like obesity, craniofacial structure, or neuromuscular conditions.

CPAP therapy is used for children who don’t respond to surgery or who have OSA without adenotonsillar hypertrophy. Paediatric CPAP requires specialised masks, careful pressure titration, and significant family support — compliance rates are lower in children than adults, particularly in younger age groups.

Orthodontic intervention — rapid maxillary expansion — can be effective in children whose OSA is related to a narrow palate and dental crowding. This treatment widens the nasal floor and increases nasal airway volume.

Weight management is important for obese children with OSA, though it’s rarely sufficient as a sole treatment.

The Bottom Line for Parents

If your child snores regularly, breathes through their mouth at night, has restless sleep, and is struggling with behaviour or concentration during the day, please raise this with your GP. Not as an afterthought — as the primary concern.

The connection between disrupted breathing during sleep and daytime behaviour in children is one of the most underappreciated relationships in paediatric medicine. Treatment is effective, the diagnostic pathway is well-established, and the developmental consequences of untreated paediatric OSA — cognitive, behavioural, and cardiovascular — are too significant to dismiss with “they’ll grow out of it.”

Some children grow out of snoring. Some children have a condition that, left untreated, shapes their development in ways we can prevent. The only way to know the difference is to investigate.