We probably need more rest than any other animal because our lives are so complicated and our brains so complex. Everyone needs a period of rest within every twenty-four hours. This is because your brain has become deprived of the necessary energy it needs to function while you are awake. Only sleep will refurbish brain cells. You can't live without it.
Sleep is a very complex process .
The brain has at least two centers that are involved with our ability to sleep and with the ability to stay asleep. Our heart rate slows down, our breathing slows and the body's temperature drops. Many scientists believe that dreaming is what helps our brain restore itself and prepares it for the next day. Even if you don't remember your dreams, we all dream. The debate over the function of dreams will most likely continue until we get a better understanding of the complexity of the human brain.