Sleep is an integral and critical part of a health-oriented lifestyle. And not only for homo sapiens! Although the scientists aren’t entirely sure if every creature of the animal kingdom sleeps, they believe that most do.
Even though it is difficult to give a definitive answer to the question, "Why do we sleep?", scientists have developed several theories that together may help explain why we spend a third of our lives sleeping. Understanding these theories can help deepen our appreciation of the function of sleep in our lives.
