Most parents are familiar with the occasional snuffly breathing of a toddler with a cold, but persistent snoring is a different matter. A child who snores heavily most nights, breathes through their mouth, seems restless during sleep, or wakes frequently may have obstructive sleep apnoea — a condition that can quietly affect behaviour, attention, and growth without the family making the connection.
The overlap between childhood OSA and ADHD symptoms is significant and underappreciated. Children who are described as inattentive, impulsive, and hyperactive, particularly in the mornings, may have a sleep-disordered breathing problem rather than, or as well as, ADHD. Treatment of the underlying airway problem sometimes produces a dramatic change.
Healthbooq (healthbooq.com) covers children's sleep health through the early years.
Normal Versus Habitual Snoring
Snoring during a viral illness is entirely normal. Nasal congestion narrows the airway temporarily and creates turbulent airflow. This settles within a week or two and is not a concern.
Habitual snoring, defined as snoring on more than three nights per week and unrelated to a current illness, is present in around 10 per cent of children. Most children who snore habitually do not have OSA — their airway is narrowed but not obstructed enough to cause apnoeas or significant oxygen desaturation. But a proportion, estimated at 1 to 5 per cent of all children, do have OSA with associated consequences.
Why Children Develop OSA
The most common cause of OSA in childhood is enlarged tonsils and adenoids. Unlike adults, where obesity is the dominant risk factor, in children the tonsillar and adenoidal lymphoid tissue (which normally peaks in size relative to the airway between ages two and eight) can simply crowd the airway during sleep when muscle tone is reduced.
Other risk factors include: obesity, Down's syndrome, craniofacial abnormalities such as Pierre Robin sequence, neuromuscular conditions, and allergic rhinitis. Children with Down's syndrome have a particularly high prevalence of OSA due to midface hypoplasia and hypotonia, and deserve routine screening.
What OSA Does
During an apnoeic event, the airway collapses and airflow stops. Carbon dioxide rises, the brain registers the threat, and a brief arousal occurs — often too short to register as a full awakening but enough to fragment sleep architecture. This happens repeatedly through the night.
The consequences of repeated sleep fragmentation and intermittent hypoxia in children include: daytime sleepiness, irritability, poor concentration, hyperactivity and impulsive behaviour, academic difficulties, and emotional dysregulation. There is also evidence that untreated severe OSA in childhood can affect cardiovascular and metabolic health over time.
Inattention and hyperactivity from sleep disruption look very similar to ADHD. Several studies have found that treating OSA with adenotonsillectomy reduces or eliminates ADHD-type symptoms in a proportion of children. The CHAT trial (Childhood Adenotonsillectomy Trial, Marcus et al., New England Journal of Medicine 2013) found that early adenotonsillectomy significantly improved behaviour, quality of life, and symptoms compared to watchful waiting, though its effect on formal neuropsychological outcomes was less clear-cut.
Children with OSA may also snore heavily, breathe through the mouth at night, adopt unusual sleep positions (often hyperextending the neck to open the airway), sweat excessively during sleep, and have nocturnal enuresis.
When to Refer
A child with habitual snoring plus any of the following should be referred to ENT or a paediatric sleep service: witnessed apnoeas (pauses in breathing), observed gasping or choking during sleep, restless sleep, unusual sleep positions, excessive daytime sleepiness, significant behavioural or educational concerns, or obesity.
Assessment
Overnight pulse oximetry is the most practical first-line investigation. An oximeter measures blood oxygen saturation throughout the night: in OSA, there are characteristic dips in saturation correlated with apnoeic events. This can be done at home with a recording oximeter, or in hospital.
Polysomnography (PSG) is the gold standard and records multiple physiological parameters including airflow, oxygen saturation, chest and abdominal movement, and sleep staging. It is time-consuming and not always available outside specialist centres, so overnight oximetry is often used to triage severity.
Clinicians also assess tonsillar and adenoidal size, nasal airflow, and the Epworth Sleepiness Scale adapted for children.
Treatment
For children with OSA caused by enlarged tonsils and adenoids, adenotonsillectomy is the first-line treatment. It resolves OSA in approximately 80 per cent of cases. The benefit is usually immediate and striking: families often report transformative improvement in sleep, behaviour, and daytime function within weeks.
Where OSA persists after surgery, or where surgery is not suitable, continuous positive airway pressure (CPAP) is used. CPAP involves wearing a mask during sleep through which air is delivered at positive pressure to maintain the airway. It requires adaptation, particularly in young children, but is effective.
Other approaches include weight loss in obese children (where this is relevant), treatment of allergic rhinitis with nasal steroid sprays, and positional therapy (though this has less evidence in children than adults).
Key Takeaways
Habitual snoring (more than three nights per week) affects around 10 per cent of children. A subset of these have obstructive sleep apnoea (OSA), where the airway partially or fully collapses during sleep, causing repeated arousals and oxygen desaturations. OSA in children commonly causes behavioural problems, inattention, and hyperactivity, and is frequently misdiagnosed as ADHD. The most common cause is enlarged tonsils and adenoids, and adenotonsillectomy resolves OSA in approximately 80 per cent of cases. Overnight oximetry or polysomnography can confirm the diagnosis.
