Have questions? Visit https://www.reddit.com/r/SNPedia

Vote to ask Presidential candidates about your DNA: see http://bit.ly/1QyVKjE

Circadian rhythm

From SNPedia

Many physiological processes vary over a 24-hour period. This oscillation, known as the body clock or circadian rhythm, can be disrupted by travel between time zones ("jet lag"), sleep deprivation, light, health problems, medications, and genetic factors. Wikipedia article.