We all need sleep, that's something our body needs to rest and revitalize our minds. One of sleep's original function is to save energy. Animals for example may be efficient at certain times of the day, some are more efficient at night while for others would be during the day. So sleep conserves energy during the inefficient time.
People who don't get enough sleep have trouble concentrating and become more vulnerable to illness, especially mental illnesses, for example stress and depression.We decrease the amount of sleep we get as we get older, so we should learn to manage our sleep time correctly. Infants usually get 16-17 hours of sleep as babies, children get 11-13 hours, as adolescents we get about 9 hours of sleep and as adults the average is about 8 hours although some people can go through the day with just 3 hours of sleep.
Sleep also plays an important role for memory. One way for sleep to strengthen memory is by wedding out the less successful connections. That means that by weakening synapses during sleep emphasizes the ones that were strengthened during wakefulness. With new knowledge and information we need to store this information, but if we had stored all the information we've ever learned our brain wouldn't be able to sustain much new information, so that's why some of that information needs to be removed and new one processed in.
Our health is a major importance when we are talking about the amount of sleep we get. The less sleep we get the more prone we are to getting sick. Depression and stress are some of the main health risks that one can face. We react to sleep deprivation as if we were ill. With more prolonged sleep deprivation,people report dizziness, tremors, and hallucinations.
clearly, we need to sleep, not only for our health, but so that we can be able to function properly.



