Yes: Short version is that you have light receptors in your eyes that you're not consciously aware of that are sensitive to blue light in the 460-480nm range &

Yes: Short version is that you have light receptors in your eyes that you're not consciously aware of that are sensitive to blue light in the 460-480nm range & have a direct effect on sleep patterns. Exposing yourself to blue light at night time will delay the onset of sleep. See the f.lux webpages for some references.