The average human will be asleep for about a third of their life (BBC.com). Many people don't get as much sleep as their bodies need; This is commonly referred to as lack of sleep. Lack of sleep can lead to an inability to sleep, also known as a condition called insomnia. Different age groups need specific sleep periods to support their bodies. Adults should sleep at least seven to eight hours each night, while children between the ages of about five and eighteen should sleep about nine to eleven hours (Morgenthaler). Without a doubt, sleep is an integral part of everyone's daily life. Sleep at all ages can have a major impact on their physical and mental health and can be harmful if they don't get enough or enough sleep each night. Getting a normal amount of sleep can have a positive effect on a person's physical state. health. For example, while the body sleeps, it will create cytokines, in which this will improve the immune system by eliminating what does not belong to the human body (Biali). In other words, people who sleep increase their chances of not getting sick because it makes their immune system stronger and healthier because many more T cells are created for the body's immune system. Therefore, sleeping regularly can make a person feel and be healthier than they are. Additionally, sleeping enough hours each night will help a person's attention span be sharper than usual and allow them to get enough rest the next night, and so on (Stibich). In other words, a person will feel more awake and energetic during the day and, of course, sleep better all the time. However, getting enough sleep for a person's body...... middle of paper ......ugh/faq-20057898>.Oz. “How Sleep Affects Your Body.” Toibeauty. vousbeauty, 2014. Web. May 8, 2014..Peri, Camille. “10 Things to Hate About Losing Sleep.” WebMD. WebMD, 2014. Web. May 8, 2014."The science of sleep." BBC. BBC, 2014. The web. May 13, 2014. sleep/articles/whatissleep.shtml>. Stibich, Marc. “Top 10 Health Benefits of a Good Night’s Sleep.” About. About, 2014. Web. May 8, 2014. .Webster, Molly. “Can you catch up on your lost sleep?” Scientific American. Scientific American, 2014.Web. May 8, 2014.fact-or-fiction-can-you-catch-up-on-your-sleep/>.