Journal of Attention Disorders, Ahead of Print.
Objectives:Children with ADHD commonly exhibit sleep disturbances, but there is limited knowledge about how sleep and sleep timing are associated with cognitive dysfunction in children with ADHD.Methods:Participants were 350 children aged 5 to 12 years diagnosed with ADHD. Three sleep-related constructs—time in bed, social jetlag (i.e., discrepancy in sleep timing pattern between school nights and weekend nights), and sleep disturbances were measured using a caregiver-report questionnaire. Linear regression models assessed the associations between sleep-related constructs and cognitive performance.Results:After adjustment for sociodemographic variables, there were few associations between time in bed or sleep disturbances and cognitive performance, however, greater social jetlag was negatively associated with processing speed (β = −.20, 95% CI [−0.35, −0.06]), visually-based reasoning (β = −.13, 95% CI [−0.27, 0.00]), and language-based reasoning (β = −.22, 95% CI [−0.36, −0.08]); all p < .05).Conclusion:Social jetlag, but not time in bed or disturbances, was associated with lower cognitive performance among children with ADHD.