{
  "abstract": "Introduction Despite evidence suggests that contemporary adolescents sleep less than previous generations (e.g., Keyes et al., 2015), findings remain mixed, often limited to a single country and with varying temporal coverage. Such temporal discontinuity hinders meaningful comparisons, highlighting the need for a more comprehensive and inclusive approach. Therefore, this study aimed to investigate changes in sleep duration among adolescents across time.Methods A cross-temporal meta-analysis was conducted to identify empirical studies that involved population-based samples comprised of young people aged between 12 and 23 years old and reported sleep duration. Linear meta-regressions were performed with the sleep duration as dependent variable and year of data collection as predictor.Results The analysis included 294 means from 84 studies, comprising n=370,440 adolescents (mean age = 15.3; 51% girls) across 23 countries with data collected between 1985 and 2022. Overall, a meta-regression showed no significant change in averaged daily sleep duration over time (β = −0.41, 95% CI [–2.27, 1.46], p = 0.67). Analyses by day type revealed contrasting patterns: unexpectedly, daily sleep duration on weekends declined by 1.27 minutes per year (β = −1.27, 95% CI [-2.18, -0.35], p = 0.007), which is around 13 minutes in a decade. Weekday sleep duration remained largely unchanged (β = 0.44, 95% CI [-1.81, 2.68], p = 0.70).Discussion Overall, adolescents’ daily sleep duration remained relatively stable from 1985 to 2022. However, weekend sleep duration appeared to decline slightly over the past 37 years. Future cross-temporal meta-analyses should explore sleep quality changes to provide more comprehensive understanding of adolescents’ sleep.Reference Keyes KM, Maslowsky J, Hamilton A, Schulenberg J. The great sleep recession: changes in sleep duration among US adolescents, 1991-2012. Pediatrics 2015;135(3):460–468. https://doi.org/10.1542/peds.2014-2707",
  "authors": [
    {
      "affiliations": [
        "University of Strathclyde"
      ],
      "name": "Abbie Greenwood"
    },
    {
      "affiliations": [
        "School of Health in Social Science, University of Edinburgh, Edinburgh, United Kingdom"
      ],
      "name": "Qiyue Xiao"
    },
    {
      "affiliations": [
        "School of Health in Social Science, University of Edinburgh, Edinburgh, United Kingdom"
      ],
      "name": "Maria Gardani"
    },
    {
      "affiliations": [
        "School of Health in Social Science, University of Edinburgh, Edinburgh, United Kingdom"
      ],
      "name": "Zsofia K Takacs"
    }
  ],
  "title": "P39 Changes of sleep duration in adolescents over time: a cross-temporal meta-analysis",
  "uid": "10bb80c7-2cb9-5671-bbdc-fcdc9c3d35b7"
}