The effects of sleep restriction and extension on school-age children: what a difference an hour makes.

By A. Sadeh, R. Gruber, A. Raviv. Child Development, 2003

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Chronotype, cognitive abilities, and academic achievement: A meta-analytic investigation☆ (2011, background): “In addition, some studies suggest that behavioral problems are more common in poor sleepers than in their control peers (Sadeh et al., 2003).”
Sleep loss, learning capacity and academic performance. (2006, background): “The authors claimed that these results have significant implications for learning and school performance, since these tasks are highly correlated with classroom behaviours and achievement tests.(100) Academic performance is also dependent on school starting time and the delayed sleep phase.”
Cognitive, Behavioral, and Functional Consequences of Inadequate Sleep in Children and Adolescents (2011, positive): “Sleepiness and inattention in real-world settings have been reported by teachers, parents, and subjects.(7,61,62) One study also found deficits in executive functioning as applied to daily life,(7) and 2 studies reported learning difficulties in a simulated or real classroom.”
Diurnal Cortisol Slopes and Mental and Physical Health Outcomes:A Systematic Review and Meta-analysis (2017, background): “Primary role of sleep?. Shortened sleep, and/or social jetlag has been found to affect both the DCS as well as metabolic, inflammatory and behavioral outcomes (Spiegel et al., 1999; Sadeh et al., 2003; Doane et al., 2010; Niu et al., 2011; Zeiders et al., 2011; Rutters et al., 2014; Turek, 2016).”