A Baylor College of Medicine expert explains to Science Blog how light impacts our circadian rhythm and whether wake-up light alarm clocks are beneficial.

“Humans have a circadian rhythm that facilitates a natural tendency to be sleepier at night and be more awake during the day,” said Dr. Philip Alapat, assistant professor of medicine in the section of pulmonary, critical care and sleep medicine. “The strongest contributor to the establishment of the circadian rhythm is light.