There are individual preferences in circadian rhythm, also known as chronotype, ranging from morning-orientation to evening-orientation. In adolescence, the sleep rhythm shifts from morningness to eveningness while school schedules are early. School performance - short-term attention and gradings - may decrease with increasing evening-orientation. One thousand nine hundred and seventy-seven adolescents aged 10-17 provided self-reported information on their chronotype as well as their gradings and completed an attention test. Controlling for age and gender, earlier chronotype was a significant predictor of better gradings and better performance in the attention test. Moreover, concerning the attention test, we found a slower and more considerate completion strategy in morning-types and faster and a more impulsive strategy in evening-types. Using structural equation modeling, age had a negative influence while class level had a positive influence on gradings and attention. The authors suggest a delay of school start times by 1 h as a measure to improve the school performance of late chronotypes. (C) 2013 Elsevier Inc. All rights reserved.
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