Now all light is not equal to your internal clock. The
Posted: Wed Jul 09, 2025 6:23 am
One of the most important signals our body uses to adjust our internal clocks is 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 they 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.
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 blu phone number list e Self-adapting light is that blue is the strongest color in early-morning sunlight — and your brain can tell when the day started.
On the other end of the spectrum, the light coming from sources like a campfire contains almost no blue light and has almost no effect on your body clock.
The problem with your computer is that your eyeballs are mostly blasted with blue light. Have you ever noticed how a soft, pale blue glows in a dark room with your computer or television on? This is because the different screens of our televisions and computers mainly emit this colour.
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 they 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.
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 blu phone number list e Self-adapting light is that blue is the strongest color in early-morning sunlight — and your brain can tell when the day started.
On the other end of the spectrum, the light coming from sources like a campfire contains almost no blue light and has almost no effect on your body clock.
The problem with your computer is that your eyeballs are mostly blasted with blue light. Have you ever noticed how a soft, pale blue glows in a dark room with your computer or television on? This is because the different screens of our televisions and computers mainly emit this colour.