, April 15 -- Have you ever wondered why human beings tend to sleep at night and work during the day? With exceptions aside, that's how almost everyone functions. Lack of sleep makes us cranky throughout the day. Why does that happen? It's all related to our biological master clock or circadian rhythm .

What is Circadian Rhythm?

The circadian cycle refers to the metabolic changes that occur within a living organism over 24 hours. The term 'Circadian' comes from two Latin words Circa meaning around and Diem meaning day.

Circadian rhythm is a natural, internal process that regulates the sleep-wake cycle and repeats roughly every 24 hours. This rhythm is influenced by external cues such as light and temperature along with internal factors...