08-05-2026
Sleep is more important than screen time for kids’ school success
Adolescence changes the brain, body, and social life. Anxiety, depression, and troubling thoughts can make school and friendships harder
Recent analysis suggests that daily habits may partly explain this link. Good sleep mattered more than screen time, exercise, or diet
Mental health symptoms cause emotional pain, but they can also shape ordinary life
A child who feels persistently worried or low may struggle to concentrate, complete assignments, or stay connected with friends
Tara Niendam is a professor of psychiatry and executive director of the University of California, Davis
“But what often matters most to young people and their families is how those symptoms affect everyday life – how they perform in school, connect with friends and navigate daily challenges,” said Niendam
“This study suggests that sleep may be one pathway linking mental health to those real-world outcomes.”
This wider view can keep attention on the parts of life young people experience every day
The team used information from the Adolescent Brain Cognitive Development Study, which follows thousands of children across the United States
The analyses included 6,754 children for grades and 7,550 for social problems
The researchers examined mental health symptoms at ages 10 to 11, habits at 11 to 12, and later grades and social problems. Parents reported most measures, while children reported their physical activity
The mental health measures covered depression, anxiety, broad emotional and behavioral problems, and distress from psychotic-like experiences
These experiences are unusual thoughts or perceptions that can occur without meaning that a child has a psychotic disorder
The team used mediation analysis, a method that asks whether a middle factor may help explain part of a relationship
In this case, the question was whether habits such as sleep could partly connect earlier mental health symptoms with later school or social outcomes
This method does not prove cause and effect. It only shows that the pattern fits a possible pathway, while other explanations may still account for the results
The researchers compared sleep, weekend screen time, exercise, and diet. They also considered each child’s age, sex, and location
Together, the four habits explained 48 percent of the link between anxiety and grades, 30 percent of the depression link, 18 percent of the link involving psychotic-like distress, and 10 percent of the link involving broad emotional and behavioral problems
Sleep quality was the strongest individual factor for anxiety, depression, and psychotic-like distress
It accounted for 36.3 percent of the anxiety link with grades, 18.5 percent of the depression link, and 8.3 percent of the link involving psychotic-like distress
“This finding surprised us. We expected sleep to be important, but we didn’t expect it to stand out so clearly above other lifestyle factors, particularly screen time,” said Jason Smucny, the first author of the study
The author added that the difference between sleep and the other habits was larger than expected
Weekend screen time was the second strongest factor linked to grades, but sleep had a much larger role
It explained 5 percent of the link with anxiety, 6.3 percent with depression, and 6.2 percent with psychotic-like distress
Weekday screen time showed weaker patterns than weekend use. The authors suggested that weekday use may vary less because children spend much of the day in school
Physical activity had small effects in several grade-related models, while diet showed little consistent influence
The paper cautioned that changing these habits alone would probably not create dramatic improvements in school outcomes
Sleep became even more dominant when the team examined loneliness, teasing, immature behavior, and difficulty getting along with other children
It was the only lifestyle factor that consistently explained more than a very small share of the connection
Sleep quality accounted for 19.9 percent of the link between depression and social problems, 19.6 percent of the anxiety link, and 23.3 percent of the link involving psychotic-like distress
Screen use, exercise, and diet contributed little to these social patterns
These results do not show that poor sleep creates social difficulties. Mental health symptoms may disturb sleep, sleep problems may worsen symptoms, or both may influence each other
The strength of these patterns changed with a child’s environment
When families faced greater financial hardship, sleep and weekend screen time explained less of the connection between mental health symptoms and grades
The authors suggested that pressures such as unstable housing or limited re
That explanation remains a possibility rather than a proven mechanism
For social problems, the pattern moved in the opposite direction. Sleep explained more of the connection when family conflict and financial hardship were higher and when the school environment was worse
Most measures came from parent reports, which may have made some relationships appear stronger because the same person rated several areas
Physical activity came from one question, while sleep quality came from 26 questions, so the measures did not have equal detail
The analysis followed variables in time order, but it did not track changes within each child closely enough to establish cause and effect
Diet was measured earlier than the other habits, and children missing grade data had slightly higher symptoms and screen use
The findings do not suggest that sleep routines can replace therapy, medication, school services, or other professional care
They do suggest that sleep deserves attention when mental health symptoms begin to affect grades or friendships
“What is encouraging is that sleep is something parents and families can address,” said Niendam
“While it won’t solve every mental health challenge, healthy sleep routines are a practical way to support a child’s emotional well-being and day-to-day functioning.”
Niendam added that families can improve sleep routines, but money problems, family conflict, and school conditions may affect how much these changes help
The study is published in the journal Psychological Medicine
—–
Like what you read? Subscribe to our newsletter for engaging articles, exclusive content, and the latest updates
Check us out on EarthSnap, a free app brought to you by Eric Ralls and Earth.com
—–
