The deportment of each student in a third-grade classroom was rated by the teacher before and after the fall change from Daylight Saving Time (DST), as a test of the hypothesis that change to or from DST has a disruptive effect on behavior. We were surprised to find a significant interaction of sex of student × ratings. Subsequent to the change from DST, the deportment of the boys improved significantly while the deportment of the girls was significantly disrupted.
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