Blue Light and Sleep: What Science Actually Says

You have probably heard that blue light from your phone or computer is ruining your sleep. While there is truth to this claim, the science is more nuanced than most headlines suggest.

How Blue Light Affects Your Body

Blue light, with wavelengths between 450-495 nanometers, is most effective at suppressing melatonin production. Melatonin is the hormone that signals to your body that it is time to sleep.

During the day, blue light exposure is actually beneficial. It boosts alertness, reaction times, and mood. The problem arises when you are exposed to it at night.

The Real Impact

Studies show that evening blue light exposure can:

However, the intensity and duration of exposure matter significantly. A quick glance at your phone is very different from two hours of scrolling.

Practical Solutions

The Bigger Picture

Blue light is just one factor. Screen content that is stimulating, stressful, or engaging can keep you awake regardless of the light spectrum. Focus on creating a calming pre-bed routine that does not revolve around screens.