Blue light from screens might play a role in dementia, but the evidence is still emerging. Some studies have found links between excessive screen time and cognitive decline, while others show mixed results[3][7].
The main concern is how blue light affects our sleep. Screens emit blue light that can disrupt our natural sleep-wake cycle, called the circadian rhythm[11]. Poor sleep quality over time has been associated with a higher risk of cognitive problems and dementia[3].
Additionally, too much screen time often means less physical activity and social interaction. A sedentary lifestyle and lack of social engagement are known risk factors for dementia[7].
However, it’s important to note that occasional screen use likely isn’t a major problem. The bigger issue is excessive, prolonged exposure, especially at night when it interferes with sleep[3][11].
Some ways to reduce potential risks include:
1. Limiting screen time, especially before bed
2. Using blue light filters or night mode on devices
3. Taking regular breaks from screens
4. Balancing screen time with physical activity and face-to-face social interaction
While more research is needed to fully understand the link between blue light and dementia, it’s clear that healthy sleep and lifestyle habits are important for brain health. Moderation in screen use and being mindful of when we use screens can be beneficial for overall well-being[3][7][11].
