21/11/2025
Digital devices are everywhere. Whilst these devices can enhance learning and enhance
community, they can also interfere with everything from sleep to mental health.
The blue light emitted suppresses secretion of the hormone Melatonin causing disruption in
sleep. Every hour of blue light steals 16 minutes of your sleep.
Excessive screen time is linked with a reduction in REM (deep) sleep, which is essential for
turning information into memory, means even if you stay awake in maths class today you
may not remember the equation you were taught tomorrow.
A study of 40, 337 children and adolescents found that regardless of the type of screen
used, more than 7 hours of screen time was associated with increased risk of low well�being, not being able to stay calm, not being curious, arguing with caregivers and in 14- 17-
year olds a significant increased risk of depression or anxiety and requiring input from a mental health professional or medication for a psychological issue.
Early data from a landmark National Institutes of Health (NIH) study that began in 2018
indicates that children who spent more than two hours a day on screen-time activities scored lower on language and thinking tests, and some children with more than seven hours a day of screen time experienced thinning of the brain’s cortex, the area of the brain related to critical thinking and reasoning.