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MIT: Better Sleep, Better Grades
An MIT study of 100 engineering students found a strong linear relationship between sleep duration and academic grades, with bedtime consistency and total sleep hours significantly impacting test performance. The research revealed that late bedtimes after a personal threshold (around 2 a.m.) correlated with lower grades regardless of total sleep obtained, and that multiple consecutive nights of good sleep, rather than a single night before an exam, are necessary for performance benefits.
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Summary
An MIT study of 100 engineering students found a strong linear relationship between sleep duration and academic grades, with bedtime consistency and total sleep hours significantly impacting test performance. The research revealed that late bedtimes after a personal threshold (around 2 a.m.) correlated with lower grades regardless of total sleep obtained, and that multiple consecutive nights of good sleep, rather than a single night before an exam, are necessary for performance benefits.
Tags
sleep-quality · academic-performance · student-health · fitbit-tracking · circadian-rhythm · cognitive-function
Key entities
MIT (organization, 0.99) · Jeffrey Grossman (person, 0.95) · John Gabrieli (person, 0.95) · Kana Okano (person, 0.95) · Fitbit (technology, 0.99) · sleep-performance correlation (concept, 0.92) · MIT engineering class study (event, 0.88)
Classification
analysis · language en · status final
Provenance
claude-haiku-4-5 via @stacklist/mcp-server@2.0.0, confidence 0.85, 2 Nov 2026