To determine whether sleep timing behaviour is associated with energy intake and diet quality in children and adolescents.
Cross-sectional analysis of nationally representative survey data.
A total of 2200 participants of the 2007 Australian National Children’s Nutrition and Physical Activity Survey aged 9–16 years with 2 days of food intake data, 4 days of use of time data and complete anthropometry. Participants were grouped into one of four sleep–wake behaviour categories: early bed–early rise (EE); early bed–late rise (EL); late bed–early rise (LE) and late bed–late rise (LL). The four categories were compared for body mass index (BMI) z-score, energy intake and diet quality assessed using the Dietary Guideline Index for Children and Adolescents. Analyses were adjusted for survey design, sociodemographic characteristics, sleep duration and physical activity level (PAL).
In adjusted multivariate regression models with sleep timing behaviour group as the independent variable, the ‘LL’ category compared with the ‘EE’ category had a higher BMI z-score (β=0.20, 95% confidence interval (CI) 0.06 to 0.34, P=0.007), and lower diet quality (β=−4.0, 95% CI −5.7 to −2.3, P<0.001). Children and adolescents who went to bed late also had a higher intake of extra foods (that is, energy-dense, nutrient-poor foods) while those whom went to bed early consumed more fruit and vegetables. Energy intake was associated with sleep duration (β=−4.5 kJ, 95% CI −6.7 to −2.4, P<0.001), but not sleep timing behaviour.
Late bedtimes and late wake up times are associated with poorer diet quality, independent of sleep duration, PAL and child and sociodemographic characteristics.
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RKG was supported by a National Health and Medical Research Council Public Health Postdoctoral Fellowship (478115). CAM is supported by an Australian Research Council Postdoctoral Fellowship. The collection of data used in study was supported by the Australian Commonwealth Department of Health and Ageing; the Department of Agriculture, Fisheries and Forestry; and by the Australian Food and Grocery Council.
The authors declare no conflict of interest.
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Golley, R., Maher, C., Matricciani, L. et al. Sleep duration or bedtime? Exploring the association between sleep timing behaviour, diet and BMI in children and adolescents. Int J Obes 37, 546–551 (2013). https://doi.org/10.1038/ijo.2012.212
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