Health
Experts Urge Caution as Sleep Trackers Gain Popularity
Millions of people around the world rely on wearable devices and phone apps to monitor their sleep, but experts caution that these tools do not measure slumber directly. Instead, devices such as smartwatches, rings, and other sensors infer sleep patterns by tracking heart rate and movement, raising questions about the accuracy of the data they provide.
The US market for sleep-tracking devices generated approximately $5 billion in 2023 and is expected to double by 2030, according to Grand View Research. As their popularity grows, specialists stress the importance of understanding what the technology can and cannot tell users.
Daniel Forger, a University of Michigan math professor who studies sleep wearables, explained that most devices rely on similar algorithms to estimate sleep stages. “The algorithms have become highly accurate for determining when someone is asleep,” he said, adding that they are less precise at distinguishing non-REM from REM sleep. “If you want to know definitively how much of each stage you’re having, in-lab studies remain the gold standard.”
Neurologist Chantale Branson of Morehouse School of Medicine said many patients arrive with detailed sleep scores from their devices, sometimes fixating on minor variations in REM sleep. She warned that the numbers should be viewed as trend indicators rather than definitive measures of sleep health. Branson recommends focusing on good sleep habits, such as establishing a relaxing bedtime routine, avoiding screens, and maintaining a comfortable environment. Patients with sleep concerns should consult a clinician before investing in wearable devices.
Forger, however, sees value in the trackers for all users, saying they can help people monitor their biological clocks and fine-tune routines. “Even if you’re getting enough hours of sleep, sleeping at the wrong times can reduce efficiency,” he said.
Some users report practical benefits. Kate Stoye, a middle school teacher in Atlanta, said her Oura Ring helped her identify patterns affecting her sleep. She noticed alcohol consumption and late-night meals negatively impacted her rest, prompting lifestyle adjustments.
Yet, overreliance on sleep trackers can also create stress. Advertising professional Mai Barreneche said she became “obsessed” with nightly scores, a condition researchers call orthosomnia. After a vacation without her device, she chose not to resume wearing it, while maintaining healthier sleep habits independently. Branson noted that anxiety over scores is a recurring issue, particularly when users compare results with friends.
Looking ahead, Forger believes the potential of sleep wearables is underestimated. Emerging research suggests that devices could detect infections before symptoms appear and monitor sleep changes linked to depression or other health risks. He said such technology could be particularly valuable in low-resource areas where access to medical care is limited.
“As understanding sleep rhythms improves, wearables could become a key tool for enhancing health and well-being,” Forger said.
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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Health
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