Effect of blue light on Melantonin
The Pineal Gland produces Melatonin roughly in approximation to the inverse proportion of bright
sun exposure in the day and complete darkness at night. Higher level of Melatonin at night
makes people sleepy, while lower level in the day makes people alert.
There are some cells in the retina of the eye containing the photopigment Melanopsin,
and its function is to signal the Pineal Gland for regulating the Melatonin secretion. Among
all other light colors, Melanopsin is most sensitive to blue light.