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Weekday Bedtime and Weekday Total Sleep Time (Hours) by Grade
Note. Shaded grey diamonds (◆) show the increasingly later bedtime that occurs with advancing grade, while the black squares (■) show the decrease in total sleep time with advancing grade. Significant difference in weekday bedtime, F(6,393)=18.05, p<.001, ηp2 = .22, and weekday total sleep time, F(6,393)=17.01, p<.001, ηp2 = .21.
