Later school start times improve adolescents' alertness and attention in class.

the verdict

INSUFFICIENT LEANING

Recorded sources

8 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that later school start times improve adolescents' alertness and attention in class?

Unclear. Several studies and reviews associate later school start times with more sleep, better attendance, less falling asleep in class, and modest academic gains, and one small principal interview study reports initial improvements in student alertness. None directly measures attention in class, so the evidence covers only part of the claim.

Verdict: PARTIAL LEAN · 8 sources for, 0 against · Last checked 3 Oct 2026

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 8

Start school later movement

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Start school later movement. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Start_school_later_movement

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More for · 7

Adolescent sleep and later school start times

2018

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Wolfson, A. R. & Ziporyn, T. (2018). Adolescent sleep and later school start times. doi.org. https://doi.org/10.1093/oso/9780198778240.003.0024

Later school start times in a flexible system improve teenage sleep

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Later school start times in a flexible system improve teenage sleep. (n.d.). cir.nii.ac.jp. https://doi.org/10.1093/sleep/zsz307

A Wake Up Call: A Qualitative Inquiry into Principals' Reflections of Later Secondary School Start Times

2025

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A Wake Up Call: A Qualitative Inquiry into Principals' Reflections of Later Secondary School Start Times. (2025). doi.org. https://doi.org/10.25394/pgs.28870487.v1

Saved by the Bell Schedule? the Effects of a Later School Start Time on High Schoolers in an Urban District

2024

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Fuller, S. C. & Bastian, K. C. (2024). Saved by the Bell Schedule? the Effects of a Later School Start Time on High Schoolers in an Urban District. eric.ed.gov. https://doi.org/10.1177/00420859211073889

Is 8:30 a.m. Still Too Early to Start School? A 10:00 a.m. School Start Time Improves Health and Performance of Students Aged 13–16

2017

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Kelley, P., Lockley, S. W., Lockley, S. W., Kelley, J., & Evans, M. D. R. (2017). Is 8:30 a.m. Still Too Early to Start School? A 10:00 a.m. School Start Time Improves Health and Performance of Students Aged 13–16. doi.org. https://doi.org/10.3389/fnhum.2017.00588

School Start Times, Sleep, Behavioral, Health, and Academic Outcomes: a Review of the Literature -

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School Start Times, Sleep, Behavioral, Health, and Academic Outcomes: a Review of the Literature - PMC Lock. (n.d.). pmc.ncbi.nlm.nih.gov. https://doi.org/10.1111/josh.12388

School Start Times, Sleep, and Youth Outcomes: A Meta-analysis

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School Start Times, Sleep, and Youth Outcomes: A Meta-analysis. (n.d.). cir.nii.ac.jp. https://doi.org/10.1542/peds.2021-054068

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