Endogenous Zeitnehmer (Biological Clock)

human circadian clock

chronobiology

definition

• The last physiological impactor of the user is \textit{endogenous zeitnehmer}, which relates to the biological clock. Biological clock is evolved in living creatures as an adaptation to day and night cycles caused by rotation of the earth \cite{koukkariIntroducingBiologicalRhythms2006}.