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Sleep-disordered breathing and cognitive functioning in preschool children with and without Down syndrome
1Centre for Research in Psychology, Behaviour and Achievement, Coventry University, Coventry, UK.
Insights
Sleep-disordered breathing (SDB) impacts typically developing children
Area of Science:
- Developmental Psychology
- Pediatric Sleep Medicine
- Genetics and Neurodevelopment
Background:
- Sleep significantly influences children's cognitive development, school readiness, and academic success.
- Children with Down syndrome (DS) face a heightened risk for sleep-disordered breathing (SDB).
- The relationship between SDB and cognitive function in preschoolers with DS remains largely unexplored.
Purpose of the Study:
- To investigate the association between sleep-disordered breathing (SDB) and cognitive, behavioral, and language outcomes in preschoolers.
- To compare these associations in typically developing (TD) children and children with Down syndrome (DS).
Main Methods:
- Cardiorespiratory polygraphy was used to assess sleep in 22 TD preschoolers and 22 with DS.
- Cognitive abilities were evaluated using the Mullen Scales of Early Learning.
- Behavioral and language assessments were conducted using the Strengths and Difficulties Questionnaire (SDQ) and MacArthur Communicative Development Inventory (MCDI).
Main Results:
- In TD children, longer sleep duration correlated with enhanced expressive language and fewer emotional difficulties.
- SDB in TD children was linked to increased conduct problems and reduced prosocial behavior.
- Conversely, in children with DS, SDB was associated with improved language understanding and the use of actions and gestures.
Conclusions:
- Findings in TD children support the hypothesis that sleep problems negatively affect cognition and behavior.
- For children with DS, complex factors may mediate or mask the sleep-cognition link, necessitating further research.
- Longitudinal studies are recommended to precisely determine the impact of sleep on cognitive development in DS, considering individual differences.
Background:
Sleep affects children's cognitive development, preparedness for school and future academic outcomes. People with Down syndrome (DS) are particularly at risk for sleep-disordered breathing (SDB). To our knowledge, the association between SDB and cognition in preschoolers with DS is unknown.
Methods:
We assessed sleep by using cardiorespiratory polygraphy in 22 typically developing (TD) preschoolers and 22 with DS. Cognition was assessed by using the Mullen Scales of Early Learning and behaviour by using the Strengths and Difficulties Questionnaire (SDQ). The MacArthur Communicative Development Inventory (MCDI) measured language level. We predicted that sleep problems would be associated with lower cognitive and behavioural functioning.
Results:
In TD children, longer sleep duration was associated with higher scores on MCDI expressive language and fewer emotional symptoms such as fear and unhappiness on the SDQ, whilst SDB was associated with increased conduct problems and less prosocial behaviour on the SDQ. Conversely, for children with DS, SDB was associated with increased language understanding and use of actions and gestures on the MCDI.
Conclusions:
The findings in the TD group support our hypotheses. We recommend that sleep problems are screened for and treated as even mild SDB may prompt poorer cognition and behaviour. For children with DS, we expect that multiple factors in this complex syndrome mask or mediate the association between sleep and cognitive development and tighter controls are necessary to uncover effects of sleep. We propose longitudinal studies as a necessary tool to assess the precise impact of sleep on cognitive development in accounting for individual differences in DS.
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