There are only some things that literally cannot live and one of them is sleep, all living organisms sleep, even plants and bacteria. People sleep almost a third of their lives. We cannot avoid it as it is important for life as our body must regenerate, rejuvenate, grow muscles, repair tissues and synthesize hormones. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an Original Essay It has been found to have many positive outcomes, helping us process memories and keep our social and emotional lives in balance. Another finding is that humans sleep more than any other species. One of the reasons for this is survival and since we are at the top of the food chain, we can kick ourselves and relax, but for other lower species it is not possible not to be aware at all times, according to animalogic the giraffe is one of the animals that sleep little ''With their long, towering necks, sleeping is not the easiest activity for giraffes. Getting up once they are lying down could take precious seconds and make them incredibly vulnerable to predators such as lions and crocodiles. The dream gives rest to the body and allows it to prepare for the next day. It's like giving your body a little vacation. Sleeping also gives your brain the ability to work things out. Scientists don't know exactly what kind of organization the brain does while we sleep, but they believe sleep may be a time when the brain sorts and stores information, replaces chemicals, and solves problems. Therefore, after learning something and sleeping, the person may have more memory on the subject. The amount of sleep a person needs depends greatly on age. The National Sleep Foundation establishes all the sleep hours of all age groups that a person should sleep: newborns: sleep range 14-17 hours a day, newborns: sleep range 12-15 hours, toddlers: sleep range sleep 11-14 hours, preschool children: sleep range 10-13 hours, school children: sleep range 9-11 hours, adolescents: sleep range 8-10 hours, young adults: sleep range 7- 9 hours, adults: sleep range 7-9 hours, elderly: sleep range 7-8 hours. If a person does not sleep one night, he or she may be in a bad mood and easily restless. After two sleepless nights, the person will have difficulty thinking and doing things. The brain and body cannot perform their usual tasks as easily as they always have. After 5 nights without sleep, the person will have hallucinations. Ultimately, it becomes impossible for the brain to give directions to the rest of the body without sleep and the person would die. We don't know exactly what happens when we sleep, we only know the effects of sleep. However, healthy sleep shows that scientists have come up with 4 theories about what happens when we sleep: inactivity theory, energy conservation theory, restorative theory, and brain plasticity theory. The inactivity theory was the adaptation of animals sleeping once safe from their predators. The main purpose of energy conservation theory is to save energy when it is least needed, such as at night. According to the Healthy Sleep article, the most reasonable theory is the reparative one in which many things happen “such as muscle growth, tissue repair, protein synthesis and growth hormone release” occurring primarily, or in some cases only, during sleep and other restorative aspects of sleep. sleep are specific to the brain and cognitive function." The theory of brain plasticity suggests that the brain changes, adapts and adapts.