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An Examination of Circadian Rhythms and Self-Reported Grades of High School Students

Status Complete
Seeking Researchers No
Start Date 09/01/2004
End Date 06/30/2005
Funding Source N/A
Funding Amount
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Last Updated 07/05/2008 01:25AM


  John Petraitis

Student Researchers
  Erin Trimble


Circadian rhythms impact a person's alertness throughout the day (Rosenzweig & Leiman, 1989). The circadian rhythms of children tend to move from being morning types (M-types) as youth to being evening types (E-types) around age 13 (Kim, Dueker, Hasher, & Goldstein, 2002). This may impact adolescents' ability to perform in early starting high schools. The purpose of this study is to examine the correlation between morningness-eveningness, daytime sleepiness, and GPA in classes throughout the school day. The hypothesis regarding M-E typology and GPA are that M-types will have a higher overall GPA, that M-types will have a higher morning GPA than E-types, and that E-types would have a higher afternoon GPA than morning GPA. It is hypothesized that E-types will report more daytime sleepiness and that daytime sleepiness will be correlated with lower grades. Participants included 200 students from 3 local high schools. Circadian typology was obtained using the MEQ (Horne & Östberg, 1976).

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