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MIT Chemistry students had their sleep monitored. Quality of sleep accounted for 25% of the variance in grades. What matters is sleep the week/month before the exam, not the night of the exam.

www.nature.com Sleep quality, duration, and consistency are associated with better academic performance in college students - npj Science of Learning

Although numerous survey studies have reported connections between sleep and cognitive function, there remains a lack of quantitative data using objective measures to directly assess the association between sleep and academic performance. In this study, wearable activity trackers were distributed to...

credit:u/CHAD_J_THUNDERCOCK

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  • Sounds like there is a bizarre kernel of truth to sleep debt. You can’t simply sleep the debt away, but a lack of consistent sleep accumulates.