How Much Sleep do Human Need?

Sleep might have evolved about 700 million years ago. We spend one-third of our life in sleep, from this we can know good sleep is essential for our body, as it affects our brain, immunity and mental emotion of body. What happen when we sleep? We tend to think off sleep as a time when the mind shut down but many important things happen while we sleep like processing, restoration and strengthening of muscles occurs during sleep. Our brain clears out harmful toxins that may reduce the risk of Alzheimer diseases. During sleep, brain cells decongest and allows space to cleanse metabolic toxins. Our body release growth hormone, which stimulates the healthy growth of muscle and bone. How much sleep do we need? Amount of sleep body needs is different for all person and some other factors like place, etc. also depends. The American Academy of Pediatrics and the Centers for Disease Control and Prevention (CDC) offer these general guideline for different age:- Birt...