Health
Swedish Study Links Teen Girls’ High Screen Time to Poor Sleep and Depression
Teenagers in Sweden are spending more time on their devices than recommended by health authorities, with teenage girls in particular showing troubling links between extended screen time, poor sleep, and symptoms of depression, according to new research.
A study conducted by researchers at Sweden’s prestigious Karolinska Institute tracked the habits of 4,810 students aged 12 to 16 over the course of a year. The results, published in the journal PLOS Global Public Health, found that both boys and girls averaged three to four hours per day on smartphones and other screens—exceeding the Swedish Public Health Agency’s guideline of two to three hours for this age group.
While both genders used their devices at similar levels, the impact was notably different for girls. The study found that teenage girls had depression scores nearly twice as high as boys at comparable levels of screen use. In addition, screen exposure among girls was closely tied to poorer sleep quality, shorter sleep duration, and disruptions in chronotype—the body’s natural preference for sleeping at a certain time.
The researchers highlighted that screen time led to what they called “sleep displacement,” a phenomenon in which bedtime is pushed later, interfering with the body’s natural sleep cycle. This effect was more pronounced in girls, potentially explaining the gender gap in mental health outcomes.
“Our results do suggest that less screen time seems healthier, in line with previous World Health Organization statements,” the study authors noted. They added that reducing screen time could help lower the “high burden of depressive states” observed among Swedish teenage girls—and possibly boys.
While the study draws strong correlations, experts cautioned against interpreting the results as proof of direct causation. Chris Ferguson, a psychology professor at Stetson University in the U.S. who was not involved in the research, pointed out that the data relied on self-reported screen time, which is known to be unreliable.
Even so, other researchers said the findings could contribute to public health policy. Ben Carter, a professor at King’s College London, argued that clearer national guidelines on screen time—especially on school nights—could help families manage digital habits and improve adolescent well-being.
“Sleep in the development of adolescents is essential,” Carter said. “Guidance could empower parents and help adolescents avoid daytime sleepiness and improve overall mental health.”
The study echoes similar findings from Norway, where a large-scale study of university students also linked screen use in bed with insomnia and reduced sleep duration, suggesting the issue may be widespread across the region.
Health
Global Mental Health Cases Near 1.2 Billion as Anxiety and Depression Drive Sharp Worldwide Rise
A major global analysis has found that mental health conditions have surged to an estimated 1.2 billion people worldwide, driven largely by steep increases in anxiety and depression over the past three decades.
The findings, published in The Lancet as part of the Global Burden of Disease Study 2023, show that the number of people living with mental disorders has almost doubled since 1990, marking a 95% rise. Researchers say major depressive disorder and anxiety disorders have seen even sharper growth, increasing by 131% and 158% respectively, making them the most prevalent mental health conditions globally.
The report describes mental illnesses as widespread conditions that create long-term disability and significant human suffering. It also highlights broader consequences for economies and public services, including reduced productivity, lower workforce participation and increasing pressure on health and welfare systems.
Researchers estimate that in 2023 alone, around 620 million females and 552 million males were affected by mental health conditions. While the overall burden is rising across both sexes, the study points to notable differences in the types and prevalence of disorders.
Among women, depression and anxiety were the most commonly reported conditions, alongside higher rates of eating disorders such as anorexia nervosa and bulimia nervosa. The report links this disparity to a mix of biological, social and structural factors, including exposure to domestic violence, sexual abuse, gender inequality and reproductive health-related changes.
In contrast, neurodevelopmental and behavioural disorders, including attention deficit hyperactivity disorder (ADHD), conduct disorder and autism spectrum conditions, were more frequently diagnosed in men.
Teenagers aged 15 to 19 were identified as the group experiencing the highest mental health burden globally, raising concerns about early onset of conditions and insufficient preventive care for young people.
The study identifies several key risk factors associated with mental illness, including childhood sexual violence, bullying and intimate partner violence. These factors are strongly linked to conditions such as depression, schizophrenia, bipolar disorder and anxiety disorders. However, researchers note that such exposures have remained relatively stable over time and account for only a portion of the overall rise.
According to the authors, broader drivers are likely contributing to the increasing prevalence of mental disorders. These include genetic and biological influences, poverty, inequality, and the growing impact of global crises such as armed conflict, pandemics, natural disasters and climate-related stress.
While mental health conditions have long been a leading cause of disability worldwide, the report warns that the situation is worsening. At the same time, health systems have not expanded services at a pace matching demand.
The authors caution that the gap between rising need and limited access to care is becoming more pronounced, leaving millions without adequate treatment or support.
Health
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