The association between sleep duration and cognitive function in 6-year-old children

Abstract

TPS 771: Diet and lifestyle, Exhibition Hall, Ground floor, August 26, 2019, 3:00 PM - 4:30 PM Background: Sufficient sleep during childhood is needed for imperative component of cognitive functions such as learning and successful school performance. We aim to investigate the effects of sleep duration on cognitive performance in 6-year-old children. Methods: Among the 645 children recruited the study which was conducted as part of a cohort named “The Environment and Development of Children”, and collected the socioeconomic and environment factors including sleep duration for children from their parents’ questionnaire. Cognitive function included measures of childhood intelligence quotient (IQ) scores (FSIQ) and Social Impairment using the Korean version of the Social Communication Questionnaire (K-SCQ) in children aged 6 years. We examined to investigate the relationship between exposure to sleep duration with continuous variables of IQ scores and social impairment (KSCQ) scores adjusting maternal age, maternal educational level, maternal occupation, maternal IQ, exposure to second-hand smoking, season, Children BMI Z-score, Gestational age, Children’s age. After sex stratified, we compared to the effect the sleep duration on IQ score and Social impairment. Results: We found that longer sleep duration in participants was associated with better performance on measures of full IQ and social impairment. The relative risk of full IQ score and K-SCQ score under 8 hours for meanly sleep duration are 0.95(95% CI: 0.91-0.99, p= 0.037) and 1.46(95% CI: 1.12-1.90) compared to more than 10 hours for sleep duration. After sex stratified, only boys were significantly associated between sleep duration and Full IQ (p=0.007), but not girls (p=0.639). However, among girls were only significant the association between sleep duration and social impairment (p=0.002), but not boys (p=0.467). Conclusions: These findings support the hypothesis that sleep duration is differentially related to some components of cognitive function by sex difference. Future studies should be needed that assess children’s sleep duration pattern and children’ health outcome for prospective cohort.