Circadian rhythms, sometimes called the circadian cycle, refer to the physical, mental, and behavioral factors all organisms experience in a 24-hour cycle. Light and dark seem to have the most significant impact on circadian rhythms, but factors like stress, diet, and social environment can also affect them.Circadian rhythms can influence various vital functions of the human body, including sleep patterns, hormone release, appetite, and body temperature. , Looking for ways to sleep better? We share the steps you can take to improve sleep hygiene and get more restful sleep each night., Use this sleep hygiene checklist to re-enforce healthy habits that help you sleep better at night. 30 tips to help you sleep like a baby! your alertness and improve your mood, while long naps can interfere with your normal sleep cycle..