Sneezing in response to bright light exposure (such as stepping out into the sunshine after sitting in a dark theater) is called photic sneeze reflex; not only is the trait inherited genetically, but your genes even determine how many times you'll sneeze in response to the light. (howtogeek.com)
Results suggest a revised model of circadian entrainment, with the adaptation of the internal clock by external time cue, resulting in a mode of photic entrainment in which light can in parallel reset central and peripheral clocks. (sciencedaily.com)
The upper photic zone is low in nutrient concentration, high in light intensity and penetration, and usually higher in temperature. (en.wikipedia.org)