University of California, Los Angeles.
Child Dev. 2013 Jan-Feb;84(1):133-42. doi: 10.1111/j.1467-8624.2012.01834.x. Epub 2012 Aug 20.
This longitudinal study examined how nightly variations in adolescents' study and sleep time are associated with academic problems on the following day. Participants (N = 535, 9th grade M(age) = 14.88) completed daily diaries every day for 14 days in 9th, 10th, and 12th grades. Results suggest that regardless of how much a student generally studies each day, if that student sacrifices sleep time to study more than usual, he or she will have more trouble understanding material taught in class and be more likely to struggle on an assignment or test the following day. Because students are increasingly likely to sacrifice sleep time for studying in the latter years of high school, this negative dynamic becomes increasingly prevalent over time.
这项纵向研究考察了青少年在夜间学习和睡眠时间的变化如何与第二天的学习问题相关。参与者（N=535，9 年级 M（年龄）=14.88）在 9 年级、10 年级和 12 年级的 14 天内每天完成每日日记。结果表明，无论学生每天通常学习多少，如果学生为了学习而牺牲睡眠时间，那么他或她在理解课堂上教授的材料方面会遇到更多困难，并且在第二天的作业或考试中更有可能遇到困难。由于学生在高中后期越来越有可能牺牲睡眠时间来学习，这种负面动态随着时间的推移变得越来越普遍。
