Whether you're feeling hungry at meal times, feeling sleepy during late night hours, or feeling awake every morning...all of these are normal and natural behavior of all living things.
The mechanism that controls these physiological activities of the body is called the “Circadian rhythm”. It is also known as the “biological clock” or “body clock”.
Not only people, but animals, insects, trees, flowers, including bacteria, have this kind of biological clock (Circadian rhythm) within them. We believe that the main part of this body clock is coming from within the brain where the signal waves are being received and sent.
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Thanks to Mr Krishnan for sharing.