Our brain is made of approximately 100 billion nerve cells, called neurons. Neurons have the amazing ability to gather and transmit electrochemical signals. The reason the only man was able to evolve from monkey to human was his ability to stand on its two feet. Customise dog this is my couch go sit over there pillow. Why? Because when the brain is at the same level as rest of the body, there is a gush of blood going into brain thus making the small, nerves and its nerve endings or Dendrites die. These neurons are connected via nerve network, so minute that any excess of blood can make them ineffective or not usable. But man learned to walk on its two feet and while sleeping they used something like a pillow to make head higher than rest of the body.
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