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the claim

Later school start times improve high school students' grades.

the verdict
INSUFFICIENT LEANING
Recorded sources
7 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 high school students' grades?

Unclear. Several reviews and one quasi-experimental district study associate later school start times with better grades or academic outcomes, but the evidence is largely correlational, single-district, or framed as potential rather than demonstrated grade improvement.

Verdict: PARTIAL LEAN · 7 sources for, 0 against · Last checked

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

Evidence 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

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More for · 6
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

Later school start times for supporting the education, health, and well-being of high school students.
2017
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R, M., EE, T., CM, D., LA, U., J, F., R, S., L, N., RS, B., AS, P., I, C., & S, H. (2017). Later school start times for supporting the education, health, and well-being of high school students.. doi.org. https://doi.org/10.1002/14651858.cd009467.pub2

PROTOCOL: Systematic Review Protocol--Later School Start Times for Supporting the Education, Health and Well-Being of High School Students
2012
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M., D. C., Lisa, N., S., B. R., John, F., Lee-Anne, U., & David, S. J. (2012). PROTOCOL: Systematic Review Protocol--Later School Start Times for Supporting the Education, Health and Well-Being of High School Students. eric.ed.gov. https://doi.org/10.1002/CL2.96

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

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

2 recorded entries grouped as this source

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School Start Times, Sleep, Behavioral, Health, and Academic Outcomes: A Review of the Literature
2016
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G., W. A., P., C. D., & B., C. J. (2016). School Start Times, Sleep, Behavioral, Health, and Academic Outcomes: A Review of the Literature. eric.ed.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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