Blue or white light helps us feel energized, but it might disrupt our sleep habits if we are exposed to it around night since blue light decreases melatonin levels. Blue wavelengths seem to be the most sensitive to brain cells, whereas red wavelengths tend to be the least sensitive. In addition to making you feel good, sunlight is also very important for your health. It keeps you healthy and strong, prevents obesity and cancer, and even improves moods! Sunlight is part of what makes up the electromagnetic spectrum. At the top of the scale is radio waves, which are used by radios and televisions. Moving down the spectrum are microwaves, infrared rays, and visible light, which make up sunlight. Visible light is made up of waves with different lengths, which correspond to colors. When light hits something solid like glass, it is mostly absorbed by the material instead of passing through it. This is why when you look at the sky it appears dark apart from all the stars that are shining through. The only parts of the sky that are really bright are those that aren't being blocked by any clouds or pollution. Everything else is disappearing into space. Our eyes are sensitive to light because this way we can see objects that would otherwise be invisible to us. Light signals move information between atoms in the eye and hormones in the brain, helping neurons communicate with each other. Without this communication, thinking processes could not occur.