Rise and Shine
利用佛罗里达州时区边界，研究发现将学校上课时间相对于日出推迟一小时，可使青少年数学和阅读成绩分别提高0.08和0.06个标准差，且对年龄较大的孩子效果更显著。
We analyze the effect of school start time on academic performance. Sleep patterns are determined in part by sunrise times, which vary across time zones. Because school start times do not fully reflect this difference, we instrument for the hours of sunlight before school with the time zone boundary in Florida. We find that moving start times one hour later relative to sunrise increases test scores by 0.08 and 0.06 standard deviations for adolescents in math and reading, respectively. In math, the effect is larger for older children and co-varies with entry into an important pubertal stage. School districts can improve performance while maintaining the current distribution of start times by moving classes earlier for younger children and later for older children.