Researchers in the U.S. asked 272,077 people — who were teenagers in the study period of 1991 to 2012 — about how often they got seven or more hours of sleep, and how often they got less sleep than
Researchers in the U.S. asked 272,077 people — who were teenagers in the study period of 1991 to 2012 — about how often they got seven or more hours of sleep, and how often they got less sleep than they should.
"Adolescent self-reported sleep has decreased over the past 20 years," study author Julie Maslowsky of the University of Texas in Austin and her co-authors concluded in the study "The Great Sleep Recession."
"Seven hours per night is two hours less than the nine hours recommended by the National Sleep Foundation, indicating a particularly concerning trend toward inadequate sleep for a large portion of U.S.adolescents at an important juncture in development."
About 30 per cent of 15-year-olds