Sleep Outshines Screen Time, Exercise, Diet for Adolescent Success, Study Finds

A UC Davis Health study published in *Psychological Medicine* reports that, for adolescents, sleep is a stronger predictor of academic success and healthy friendships than screen time, exercise or diet. The research, which examined a large cohort of high‑school students, found that adequate sleep duration and quality were associated with higher grades and more positive peer relationships, whereas the other lifestyle factors showed weaker or inconsistent links.

The analysis highlighted that the benefits of sleep were especially pronounced among youth who reported anxiety, depression or other mental‑health challenges. In these subgroups, poor sleep correlated with greater academic difficulties and social withdrawal, while sufficient rest helped mitigate those risks. The study controlled for variables such as socioeconomic status and baseline mental‑health symptoms, underscoring sleep’s independent role.

These findings suggest that interventions aimed at improving sleep hygiene could be a valuable component of strategies to support students’ academic and social well‑being, particularly for those struggling with mental‑health issues. Further research is needed to explore the mechanisms behind sleep’s protective effects and to develop targeted programs for schools and families.