The Correlation Between Sleep and Academic Performance: A Literature Review

Sleep is a fundamental biological function experienced by everyone. Sleep occurs every night, but it is far more than just a period of rest. Sleep is an important function that supports both physical and mental health. This review examines the effects of sleep on academic performance, and the correlation between sleep and school performance. Specifically, how the quality of sleep, quantity of sleep, and sleepiness during the day affect a student’s academic performance. How sleep contributes to in-class performance, and whether lack of sleep or gain in sleep can affect exam scores or grade point average (GPA). At the end, this review discusses whether a change in school start time is necessary, and the benefits and disadvantages of a later school start time on students’ sleep. The results show that sleep does have an effect on school performance. Whether it be maintaining focus in class, memory stabilization, or the ability to transcribe information studied into memory, sleep plays an important role in these functions. Most research supports a positive association between sleep and higher GPA, as well as better school performance. These findings underscore the importance of sleep as a foundation for learning and cognitive development during childhood and adolescence. At the same time, important uncertainties remain. Some studies report weak or inconsistent links between sleep duration and standardized test scores, suggesting that academic outcomes may depend on additional factors. Moreover, the relative contributions of sleep duration, sleep quality, and timing are not yet fully disentangled, leaving open questions about which aspects of sleep are most influential for academic success. More work should examine how sleep interventions, such as delayed school start times, or digital media restrictions affect both sleep patterns and academic outcomes. Overall, this body of research highlights sleep as an educational priority. Improving adolescent sleep habits has the potential to enhance academic performance.