One of the most important signals our body uses to adjust our internal clocks is light.

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“Now you could take a person, put them in a dark room without knowing what time it is outside, and for the rest of their life, that person would essentially sleep on a 24-hour cycle and wake up,” says Stevens. But that doesn’t mean our internal clocks are perfectly timed. Although it varies from person to person, on average your body clock is about 12 minutes off.

So to ensure your body is in tune with the earth’s natural day-night cycle (after a few weeks, 12-minute daily alternations would really add up) your body needs to constantly take cues from your surroundings and that information use your clock. And this is where your computer comes in.

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Blue light

Stevens says scientists discovered in the late 1990s that our eyes have special cells that register light but, unlike the cells around them, do not contribute to our vision. Instead, these cells transmit information about whether or not the phone number library y see light directly to the part of the brain that controls your internal clock, the suprachiasmatic nucleus. With this information about the light outside, your suprachiasmatic nucleus helps shift your internal clock forward or backward.

Now all light is not equal to your internal clock. The special cells in your eyes react to one color of light in particular: blue. (Scientifically, it’s light between 460 and 480 nanometers in wavelength.) One theory as to why your brain uses blue Self-adapting light is that blue is the strongest color in early-morning sunlight — and your brain can tell when the day