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Relationships between school start time, sleep duration, and adolescent behaviors

  • Kyla L. Wahlstrom
    Affiliations
    Department of Organizational Leadership, Policy and Development, 210D Burton Hall, College of Education and Human Development, University of Minnesota, Minneapolis, MN 55455
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  • Aaron T. Berger
    Affiliations
    Division of Epidemiology and Community Health, University of Minnesota School of Public Health, 1300 South 2nd St, Suite #300, Minneapolis, MN 55454
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  • Rachel Widome
    Correspondence
    Corresponding author at: Division of Epidemiology and Community Health, 1300 South 2nd St #300, Minneapolis, MN 55454. Tel.: +1 612 624 3518.
    Affiliations
    Division of Epidemiology and Community Health, University of Minnesota School of Public Health, 1300 South 2nd St, Suite #300, Minneapolis, MN 55454
    Search for articles by this author
Published:April 08, 2017DOI:https://doi.org/10.1016/j.sleh.2017.03.002

      Abstract

      Objectives

      The objectives were 2-fold: (1) to examine how high school start times relate to adolescent sleep duration, and (2) to test associations between sleep duration and mental health– and substance use–related issues and behaviors in teens.

      Design

      This study examines selected questions from survey data collected between 2010 and 2013 high school students.

      Setting

      Respondents included more than 9000 students in grades 9 to 12 in 8 high schools in 5 school districts across the United States.

      Measurements

      The survey instrument is the 97-item Teen Sleep Habits Survey. Logistic regression models were used to calculate adjusted odds ratios and 95% confidence intervals. Because of clustering within schools and the use of repeated measures, generalized estimating equations were used to account for variance inflation.

      Results

      Greater sleep duration was associated with fewer reports of various mental health– and substance use–related issues and behaviors (all P values <.01). For instance, for each additional hour of sleep reported, there was a 28% reduction in the adjusted odds of a participant reporting that he or she felt “unhappy, sad, or depressed.” Later wake-up times were associated with a reduction in risk for some, but not all factors. Later start times were significantly associated with greater sleep duration.

      Conclusions

      Given that later start times allow for greater sleep duration and that adequate sleep duration is associated with more favorable mental health– and substance use–related issues and behaviors, it is important that school districts prioritize exploring and implementing policies, such as delayed start times, that may increase the amount of sleep of adolescent students, which is needed for their optimal development.

      Keywords

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