Light can increase alertness both during the day and the night; and it reduces the drowsiness that occurs at night. Short wavelength (blue) light has the greatest capacity to increase alertness.
Bright blue light can also improve auditory attention, suggesting that the effects of light on alertness and attention are not mediated by the system responsible for conscious visual perception.
Rather they seem to be mediated by the retino-hypothalamic system that starts with a newly discovered set of receptors in the retina, the 'intrinsically photosensitive ganglion cells'.
Dyslexia Research Trust - Vision & Coloured Filters
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