Mental health
Study links teen girls’ screen time to sleep disruptions and depression

Excessive screen time among adolescents negatively impacts multiple aspects of sleep, which in turn increases the risk of depressive symptoms — particularly among girls, new research has found.
Recently, the Swedish Public Health Agency published recommendations that adolescents use no more than two-to-three hours of daily leisure screen time, partly to promote better sleep.
Previous studies have suggested associations between screen time, sleep disruptions, and depression in teens.
However, sleep problems and depression often coincide, and the direction of these associations has been unclear.
In the new study by Sebastian Hökby of Karolinska Institutet, Sweden and colleagues, researchers tracked 4,810 Swedish students aged 12-16, collecting data on sleep quality and quantity, depressive symptoms, and screen usage at three timepoints over the course of a year.
The researchers found that increased screen time led to deteriorated sleep within three months, impacting both the duration and quality of sleep.
Screen time was also found to postpone sleep times towards later hours – disrupting multiple aspects of the human sleep-wake cycle at once.
Among boys, screen time had a direct adverse effect on depression after twelve months, while among girls the depressive effect was mediated through sleep disturbances.
Sleep could explain about half (38 per cent-57 per cent) of the association between screen time and depression in girls.
Boys who spent more time on screens also experienced sleep disruptions, but these were not strongly associated to later depression.
The authors summarise: “In this study, we found that adolescents who reported longer screen times also developed poorer sleep habits over time. In turn, this led to increased depression levels, especially among girls.”
They add: “Our results do suggest that less[…] screen time seems healthier, in line with previous World Health Organization statements…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.”
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Menopause
CBT shows promise for menopause insomnia and hot flashes

Cognitive behavioural therapy (CBT) may offer short-term relief for menopause insomnia and night-time hot flushes, a pilot study suggests.
CBT is a structured, short-term talking treatment that helps people change thoughts and behaviours that can worsen sleep problems.
Researchers found the intervention was linked to meaningful short-term improvements in insomnia severity, hot flush interference, sleep self-efficacy, or confidence around sleep, and depressive symptoms.
The Menopause Society said insomnia affects an estimated 20 to 60 per cent of perimenopausal and postmenopausal women in the US.
Ongoing research is focusing on effective treatments because insomnia can have serious physical and psychological effects.
Dr Monica Christmas, associate medical director for The Menopause Society, said: “Nocturnal hot flushes (night sweats) and sleep disruption can have a significant effect on the quality of life with many women claiming extreme impairment due to symptoms that often start in early perimenopause and last 10 or more years.”
“Sleep disturbances can persist even in those using pharmacological therapy to manage hot flushes.
“The study’s findings highlight the utility of cognitive-behavioural therapy as a standalone treatment for insomnia and hot flushes, offering women an alternative or adjunct to pharmacological treatments.”
Insomnia is defined as disturbed sleep associated with distress or impaired daily functioning and is one of the most common complaints in perimenopause and postmenopause.
It can reduce quality of life and is linked to higher healthcare use and costs, disability, depression and cardiovascular disease.
Hot flushes occur in 60 to 80 per cent of women during the menopause transition and can persist for four to five years on average.
Night-time hot flushes are linked to sleep disruption, and women may respond by napping or spending longer in bed, which can help keep insomnia going.
Previous studies have shown that cognitive behavioural therapy is an effective treatment for insomnia and may also help women cope with hot flushes and other menopause symptoms.
However, few trials have looked at both insomnia and hot flushes together.
Insomnia during and after the menopause transition is complex and can have many causes, including ageing, hormone fluctuation, hot flushes, other sleep disorders, psychiatric and medical conditions and psychosocial stressors.
Because women with acute and sustained insomnia can experience greater negative health effects, effective treatment is important.
The pilot study concluded that CBT was feasible and may be a promising approach for menopause-related insomnia and nocturnal hot flushes, although the benefits appeared to lessen after three months.
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