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Screen Time Linked To Poor Sleep, Depression Among Teen Girls

Medically reviewed by Carmen Pope, BPharm. Last updated on April 3, 2025.

By Dennis Thompson HealthDay Reporter

THURSDAY, April 3, 2025 -- Can’t get your teenage girl off her smartphone, iPad or laptop?

This could cost her much-needed sleep and increase her risk of depression, a new Swedish study says.

Teenagers who spend more time on screens tend to get worse sleep, both in terms of sleep quality and duration, researchers reported April 2 in the journal PLOS Global Public Health.

Screen time also caused teens to put off sleep until later hours, affecting their wake/sleep cycles, researchers found.

These sleep disturbances are linked to later depression symptoms in girls, but not in boys, results show.

“We found that adolescents who reported longer screen times also developed poorer sleep habits over time,” concluded the research team led by Sebastian Hökby, a doctoral student at the Karolinska Institute in Sweden. “In turn, this led to increased depression levels, especially among girls.”

For the study, researchers tracked more than 4,800 Swedish students between 12 and 16 years of age, collecting data on sleep, depression symptoms and screen time at three different points during the course of a year.

Depression symptoms among girls were more than twice those of boys, a gender difference that’s been found in earlier studies, researchers reported.

Results also showed that 38% to 57% of girls’ depression symptoms could be explained by changes in sleep patterns driven by screen use.

Boys who spent more time on screens also experienced sleep disruptions, but these were not significantly linked to later depression symptoms.

The American Academy of Pediatrics recommends limiting screen time for children but does not set a specific amount of time that could be considered healthy, citing a lack of strong evidence to set such guidelines.

By comparison, the Swedish Public Health Agency recommends that teenagers spend no more than two to three hours a day on screens, partly to promote better sleep, researchers said.

“The public health recommendation to promote sleep by means of changing screen-related behaviors is … supported by this study,” researchers wrote.

“If screen times were somehow reduced, for example through public health policies, our results imply that the high burden of depressive states among young Swedish women, and maybe young men, would likely decrease,” they added.

However, researchers noted that their results show that Swedish teens likely are exceeding national screen time guidelines by about an hour.

Disclaimer: Statistical data in medical articles provide general trends and do not pertain to individuals. Individual factors can vary greatly. Always seek personalized medical advice for individual healthcare decisions.

© 2025 HealthDay. All rights reserved.

Posted April 2025

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