The findings arrive at a moment when social media has become deeply woven into the daily routines of young adults. Young people in this age group spend roughly five hours a day on social platforms, and in the George Mason study more than 85 percent of students reported using YouTube, Instagram, and Snapchat every day. Against that backdrop, sleep has emerged as a critical vulnerability. Although seven to nine hours of sleep per night is recommended for young adults, previous research has found that one-third of college students fall short of seven hours. Chronic insufficient sleep is not a benign inconvenience: over time it has been linked to depression, obesity, heart disease, and diabetes, making sleep a plausible biological conduit through which digital habits could shape long-term health.

The study’s design gave it an unusually strong footing for this kind of question. The researchers analyzed data from 349 first-year students ages 18 to 24 participating in Mason: Health Starts Here, a broader longitudinal study examining predictors of physical and mental health throughout the undergraduate years, led by principal investigator Lawrence Cheskin, distinguished professor in the Department of Nutrition and Food Studies. Students completed surveys at three points: August 2019, February 2020, and August 2020. That staggered timing allowed the team to test whether social media use preceded changes in sleep, and whether changes in sleep preceded changes in perceived health, rather than simply measuring all three variables at once.

This lagged structure matters because cross-sectional studies, which capture a single moment in time, cannot disentangle direction. A student who sleeps badly may scroll more because they are awake and bored, or a student who scrolls late may sleep badly because of it; a one-time snapshot cannot tell the difference. By measuring social media use first, sleep quality half a year later, and self-rated health a full year after the initial surveys, the George Mason team could show that the sequence ran from platform use through sleep to health perception. Self-rated health, though a subjective measure, is a well-established indicator in public health research that correlates with objective health outcomes and mortality risk in broader populations.

Study lead author Akosua Mainoo, an alumna of the Department of Global and Community Health, emphasized that the implications extend beyond the obvious cost of screen time itself. These findings suggest that students’ social media habits early may have effects beyond the time spent on the phone, she said. Sleep appears to be one way those habits may carry over into how students perceive their health months later. In other words, the harm, if it exists, is not merely that hours on social media displace hours of sleep directly, but that habitual use appears to degrade sleep quality in a way that persists and accumulates, eventually coloring how students judge their own physical well-being.

One result genuinely surprised the research team. Greater overall social media use was associated with poorer sleep, but nighttime use specifically was not. The researchers noted that previous studies on nighttime social media use and sleep have produced mixed findings, and they suggested that the effects may depend on other factors, such as light exposure affecting melatonin levels. Melatonin, the hormone that regulates the sleep-wake cycle, is suppressed by light reaching the retina in the evening, and screens emit light in wavelengths that can interfere with this process. But the timing, intensity, and duration of that exposure vary enormously between individuals, which may explain why nighttime use alone did not emerge as a distinct predictor in this cohort while total daily use did.

The study also carried an unintended historical dimension. Because the surveys spanned August 2019 to August 2020, the data captured the arrival of the COVID-19 pandemic, which upended campus life, moved instruction online, and reshaped how students used both their devices and their time. The full article title reflects this: Social Media Use, Sleep Quality, and Self-Rated Health Among First-Year Students at George Mason University Before and After the COVID-19 Pandemic. The researchers acknowledged limitations including self-reported data, which can be subject to recall and reporting biases, and participant drop-off over time, which is a common challenge in longitudinal studies. They called for more longitudinal research on how social media use may affect sleep and health.

The practical message the researchers drew from the work is one of moderation rather than abstinence. Asked what students should take from the findings, the team pointed to the value of reducing social media use. Social media is a part of everyday life for college students, so the expectation isn’t to eliminate it, said Mainoo, who earned an MPH in Epidemiology in 2022 and a BS in Community Health in 2020. But young people can be more intentional about setting time limits and creating phone-free zones. Cheskin put it more bluntly: less is more when it comes to social media use by young college students. Reducing use, he noted, can leave more time for direct interactions with peers and others, an activity with its own documented benefits for well-being.

For a generation whose social lives, coursework, and even sleep-adjacent wind-down rituals run through a handful of apps, the study reframes the stakes. The concern is no longer just the hours lost to scrolling in the moment, but a slower mechanism in which habitual heavy use erodes sleep quality over months, and degraded sleep in turn dims students’ sense of their own health. If sleep is indeed the pathway, then interventions aimed at protecting sleep, whether through time limits, phone-free zones, or better evening routines, could do double duty, preserving both rest and the broader health perception that helps young adults stay engaged with their lives. The research team also included Lilian de Jonge and Fritz Nii Tettey Lokko of the Department of Nutrition and Food Studies, and Jerome L. Short, Eleanor A. Speidel, Jeremy Maciarz, Patricia J. Mejia, and Emmarose Logan Price of the Department of Psychology. The study was funded by the George Mason Institute for Biohealth Innovation.

Subject of Research: The longitudinal relationship between social media use, sleep quality, and self-rated health among college students

Article Title: More social media use linked to poorer sleep and self-rated health among college students

Article References: More social media use linked to poorer sleep and self-rated health among college students. (n.d.). Original publication

Image Credits: AI Generated

DOI: Not provided

Keywords: social media, sleep quality, self-rated health, college students, longitudinal study, public health, melatonin, George Mason University, Public Health Reports, young adults, COVID-19, screen time