Blue Light Before Bed: Harmless Habit or Health Risk?

The more we use our phones, the more we’re exposed to blue light—and scientists continue to debate what that means for our health. Some studies suggest blue light disrupts sleep cycles, while others argue the impact depends on how and when screens are used.

According to Harvard researchers, light of any kind can suppress melatonin, the hormone that helps regulate sleep. Blue light, in particular, has been found to suppress melatonin more strongly at night, which may make it harder to fall asleep. That’s why many sleep specialists advise turning off devices at least an hour before bedtime.

Dr. Monika Mathur, a sleep medicine physician with Kaiser Permanente, says even short periods of screen use close to bedtime can have consequences. “At least an hour or two before bedtime you should really not have screens available,” she explained. Dr. Mathur told NBC Palm Springs, Melatonin being released at night cues the body to get ready for bed, and without that release, our bodies have a hard time falling asleep.

But not all experts agree on how harmful blue light truly is. Researchers at the Icahn School of Medicine at Mount Sinai suggest factors like screen brightness, distance from the eyes, and duration of use may play just as big a role as the light itself.

Meanwhile, people like Kristina Morales, who spends long days in front of a computer, are turning to blue light glasses and screen protectors as a precaution. Specialists also note that children are especially sensitive, making it even more important for families to limit evening screen use.

As the debate continues, one piece of advice remains consistent: when it comes to sleep, less screen time before bed is better.