All living things on your planet undergo an unescapable and predictable daily in their environment: Day becomes night. To cope with this almost every living organism has developed an internal timing system, or circadian clock, every living organism spends its 24-hour day;
• Getting energy (food)
• Optimizing energy by using some for maintaining body functions and storing the rest for later user
• Protecting itself from harmful agents and predators
• Repairing itself or growing
• Reproducing
All of these functions are guided by a circadian clock, which optimizes every organism’s ability to carry out these tasks by assigning each of theses essential aspects to an optimum time of the day or night.

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