Because of the light within the eye of the us called (Melanopsin) There is a shade of light blue sensitive wavelength range 460-480 nm, and as a result, we have difficulty sleeping.
Because the light inside our eyes called (Melanopsin) are sensitive to shades of blue light in the wavelength range 460-480 nm and allowed us to sleep more difficult.
Since the photosensitive device within our eyes called (Melanopsin). There is sensitivity to shades of blue light at the wavelength 460-480 nm. As a result, we can sleep more difficult.