Anne G. Wheaton, Gabrielle A. Ferro, and Janet B. Croft, “School Start Times for Middle School and High School Students – United States, 2011–2012 School Year,” Morbidity and Mortality Weekly Report 64, no. 30 (August 7, 2015): 809–813; Karen Weintraub, “Young and Sleep Deprived,” Monitor on Psychology 47, no. 2 (2016): 46.