*Corresponding Author E-mail: dubeysneha176@gmail.com
The term circadian comes from the Latin CIRCA meaning around and DIEM meaning day. the formal study of biological temporal rhythms, such as daily tidal, weekly seasonal and annual rhythms is chronobiology (1) human biological rhythm are largely determined by genetic coding, with input from the external environment influencing the cyclic effect (2)
Circadian rhythm, chronobiology, environment
