Child Sleep: When Poor Sleep Changes Everything Else

Sleep plays a fundamental role in child development — memory consolidation, emotional regulation, growth, immunity. A child who doesn't sleep enough, or who has poor-quality sleep, will function below their capacities on all these fronts — often without adults or the child themselves making the connection.

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What lack of sleep produces in children

On mood and behaviour

An under-sleeping child can be irritable, emotionally unstable, and display behaviours resembling those of ADHD: agitation, difficulty staying still, impulsivity. These symptoms can disappear simply by restoring sufficient sleep.

On learning

The consolidation of academic learning happens primarily during sleep. A child who sleeps little retains learning less well, has more concentration difficulties, and their academic results can suffer as a result. I go deeper into this mechanism in The Practical CBT Guide.

On physical health

Sleep is a time of cellular repair, growth hormone secretion, and immune strengthening. Under-sleeping children are more frequently ill and may show delayed growth in severe cases.

Sleep needs by age

• 1-2 years: 11-14h (night + nap)
• 3-5 years: 10-13h
• 6-12 years: 9-12h
• 13-18 years: 8-10h

What helps

Regular bedtime routines, a cool and dark bedroom, no screens 1 hour before bed, stable bedtime even at weekends — these simple principles, applied consistently, significantly improve the quality and duration of sleep.

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