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
World Cup Emotion Can Strain the Heart, Cardiologists Warn Fans at Risk
As the World Cup begins, medical experts are cautioning football fans with underlying heart conditions that the emotional intensity of matches can place unexpected strain on the cardiovascular system.
Cardiologists say that the excitement, tension, and anxiety generated during high-stakes games can trigger physical reactions similar to intense exercise, raising heart rate, blood pressure, and stress hormones.
“Intense emotions, whether positive or negative, can act as ‘precipitating risk factors’ for cardiovascular events such as heart attack,” said Paola Santalucia, a cardiologist and board member of the European Heart Network.
She explained that moments of extreme excitement, such as a decisive penalty shootout or a last-minute goal, may pose risks for people already living with heart disease. Those with additional risk factors, including hypertension, obesity, or smoking habits, are also advised to be cautious during emotionally charged matches.
Research using wearable devices has shown that during major football events, some fans experience heart rates climbing as high as 150 beats per minute. That level is comparable to sprinting and reflects how strongly the body reacts to emotional stress.
A study examining supporters during the 2025 German Cup final found that even watching from home can significantly affect physiological responses. “They still had an increase in heart rate that compares to walking, even though they didn’t walk,” said Christian Deutscher, professor of sports economics at Bielefeld University and co-author of the study.
He noted that the most intense reactions often occur not during goals themselves, but during moments of uncertainty such as VAR checks, penalty shootouts, or shots striking the post. These unpredictable situations, he said, are what drive the strongest emotional and physical responses among fans.
Deutscher also pointed out that stadium spectators may experience even greater strain due to environmental factors such as heat and alcohol consumption.
However, experts emphasize that football itself is not inherently dangerous. Instead, it is the body’s natural response to excitement that can create temporary stress.
“The adrenergic stimulation is at its max: extreme high blood pressure, high heart rate, and adrenaline, cortisol, skyrocketing,” said Dan Atar, professor of cardiology at Oslo University Hospital. In rare cases, he added, this surge can contribute to the rupture of arterial plaque in vulnerable individuals, potentially leading to a heart attack.
Atar stressed that such events can occur in everyday situations as well, including physical exertion like shoveling snow. “It is in no way dangerous to watch a football game,” he said. “All this is physiologic. It’s not dangerous to be excited.”
Still, he acknowledged that combining emotional stress with alcohol, heat, and pre-existing conditions can increase risk for some viewers.
Doctors advise those at higher risk to continue prescribed medications, limit alcohol intake, avoid smoking, and watch for warning signs such as chest pain or irregular heartbeat.
“The key message is not to avoid enjoying the match, but to do so with moderation and awareness,” Santalucia said.
Health
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Health
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