Simple explanation: Screens give off a type of light called blue light. This light is like the sunlight we see during the day, and it can make our eyes work harder to see clearly. When our eyes are working too hard for too long, they get tired, and that’s why we feel sleepy after looking at screens.
Examples
- A child playing a video game for hours feels tired and sleepy after.
- Someone reads emails on their laptop all afternoon and struggles to sleep that night.
- A teenager stares at their phone while lying in bed, only to fall asleep mid-scroll.
Ask a question
See also
- How Does Consequences for kids' of endless screen time Work?
- Should schools limit kids screen time the science is murky?
- Screen Time: How Much Is Too Much?
- What are reflex tears?
- What are cataracts?