Snoring (Children)
Snoring in children is not a benign or trivial issue. While the sight of a snoring child may seem endearing, persistent snoring reflects partial upper airway obstruction during sleep — and when this crosses into obstructive sleep apnoea (OSA), it can have profound and lasting effects on a child’s development, behaviour, cardiovascular health, and long-term brain function. Paediatric sleep-disordered breathing is distinct from its adult counterpart in its causes, its consequences, and its treatment, and warrants prompt specialist assessment when present.
Definitions and the Sleep-Disordered Breathing Spectrum
Sleep-disordered breathing in children exists on a spectrum:
- Primary snoring: Snoring without measurable disruption to sleep architecture, oxygen saturation, or ventilation. Affects approximately 10–12% of children aged 1–9 years. Traditionally considered benign, though emerging evidence suggests even primary snoring may have subtle neurodevelopmental effects.
- Upper airway resistance syndrome (UARS): Increased respiratory effort during sleep causing arousal and sleep fragmentation without frank apnoeas or oxygen desaturation. Underdiagnosed in children as it may not be detected on standard home oximetry.
- Obstructive sleep apnoea (OSA): Recurrent episodes of partial or complete upper airway obstruction during sleep, causing oxygen desaturation and sleep disruption. Defined by an AHI ≥1 event per hour in children (stricter than the adult threshold of AHI ≥5). Affects approximately 1–5% of children.
Causes in Children
Tonsillar and Adenoid Hypertrophy
Enlarged palatine tonsils and adenoids are the dominant cause of paediatric OSA, responsible for the vast majority of cases in the 2–8 year age group. The lymphoid tissue of the tonsils and adenoids grows rapidly in early childhood, reaching its maximum size relative to airway dimensions between the ages of three and six. During this window, even moderately enlarged tonsils and adenoids can significantly narrow the upper airway during sleep when muscle tone is reduced. The tonsils and adenoids then undergo progressive involution throughout the school years, which explains why many children appear to “grow out” of snoring by adolescence — though the neurodevelopmental consequences of years of sleep disruption may not resolve with the anatomy.
Nasal Obstruction
Chronic nasal obstruction — from allergic rhinitis, adenoid hypertrophy, nasal septal deviation (less common in children), or nasal polyps — forces children to breathe through the mouth during sleep. Mouth breathing profoundly changes the upper airway dynamics: the tongue falls posteriorly, the pharyngeal dilator reflexes are less effective, and airway resistance increases. Treating nasal obstruction with a nasal steroid spray can produce significant improvements in snoring and mild OSA and may reduce the need for surgery in some children.
Obesity
Childhood obesity is an increasingly significant contributor to paediatric OSA. Fat deposition in the pharyngeal soft tissues narrows the airway, and the increased chest wall mass reduces lung volumes and functional residual capacity, making the airway less stable during sleep. Obese children with OSA have a higher residual AHI after adenotonsillectomy than non-obese children — combined treatment addressing both the anatomical and weight components is usually necessary.
Craniofacial and Neuromuscular Conditions
Children with Down syndrome, Pierre Robin sequence, Treacher Collins syndrome, achondroplasia, and other conditions affecting jaw size, midface development, or tongue position have significantly increased rates of OSA that may persist after adenotonsillectomy and require additional interventions. Children with cerebral palsy and other neuromuscular conditions have reduced pharyngeal muscle tone that independently contributes to upper airway collapse. These children require assessment in a specialist paediatric sleep centre.
Consequences of Untreated Paediatric OSA
Neurodevelopment and Behaviour
The most important and well-documented consequences of paediatric OSA relate to neurodevelopment. Sleep is the period during which the developing brain consolidates memory, pruning synaptic connections and transferring information from the hippocampus to long-term cortical storage. Fragmented, non-restorative sleep disrupts this process. Children with untreated OSA have measurable deficits in:
- Attention and executive function (particularly working memory and cognitive flexibility)
- Language processing and verbal learning
- Academic performance, particularly in literacy and numeracy
- Behaviour — hyperactivity, impulsivity, and oppositional behaviour that may be misdiagnosed as ADHD
- Emotional regulation and social competence
Studies using MRI have demonstrated structural differences in the grey matter of several brain regions in children with OSA compared with controls — changes that partially reverse after adenotonsillectomy. This evidence supports the importance of early treatment.
The OSA–ADHD Overlap
The behavioural manifestations of paediatric OSA — inattention, hyperactivity, and impulsivity — closely mimic ADHD. A significant proportion of children referred for ADHD assessment have underlying sleep-disordered breathing that is either the primary cause or a significant contributing factor to their symptoms. In any child presenting with behavioural concerns, assessment for sleep-disordered breathing is appropriate before ADHD is attributed solely to a primary attention disorder.
Physical Growth
Growth hormone is secreted primarily during deep (slow-wave) sleep. OSA disrupts slow-wave sleep, reducing growth hormone secretion and potentially contributing to failure to thrive or growth deceleration in affected children. Adenotonsillectomy in OSA children is associated with improvement in growth velocity in some studies.
Cardiovascular Effects
Even in children, significant untreated OSA produces measurable changes in blood pressure, heart rate variability, and ventricular function. Pulmonary hypertension (cor pulmonale) can develop in severe untreated paediatric OSA, though this is now uncommon in countries with accessible paediatric ENT services.
Enuresis and Other Effects
Nocturnal enuresis (bed wetting) is more prevalent in children with OSA and may improve substantially after adenotonsillectomy. Morning headaches, restless sleep, and unusual sleeping positions (hyperextended neck, prone positioning) are common in affected children and often go unremarked by parents.
Assessment
The assessment includes a detailed sleep and developmental history from parents, examination of the child’s nasal airway, tonsil and adenoid size, jaw anatomy, and palate — alongside general growth and developmental parameters. A validated snoring questionnaire and the Paediatric Daytime Sleepiness Scale help quantify symptom burden.
Where OSA is suspected, an overnight oximetry study provides a useful and accessible screening tool — a positive result (oxygen saturation dips below 90%, multiple desaturation events) is highly predictive of OSA. Formal polysomnography (attended overnight sleep study) provides definitive diagnosis and quantification but is not always readily accessible and is not necessary in every case before proceeding with treatment in a child with classical features.
Treatment
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Dr Roth’s Clinical Perspective
Snoring in children should not be normalised. A child who snores loudly every night, who breathes through their mouth, who is restless in sleep, or who has unexplained behavioural or learning difficulties warrants ENT assessment — the connection between sleep-disordered breathing and neurodevelopmental consequences in children is well established. The most common treatable cause in this age group is tonsillar and adenoid hypertrophy, and adenotonsillectomy in appropriately selected children produces a dramatic and often immediate improvement in sleep quality and daytime behaviour.
— Dr Jason Roth, MBBS, FRACS (ORL-HNS), IBCFPRS
Specialist Otolaryngologist & Head and Neck Surgeon
Specialist registration — Otorhinolaryngology, Head & Neck Surgery
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