Sleep is essential for virtually all living creatures. It is very important for human beings because without sleep they cannot function properly. Sleep can affect humans in all sorts of ways while performing different activities. Such as driving, working or daily things. Sleep can affect our daily lives and there are several factors that can cause sleep disturbances, sleep deprivation and health problems. As well as medical problems that can cause sleep problems. Humans need sleep to survive, it can affect us physically, mentally and will affect us differently with little or no sleep and with different types of sleep. Sleep affects humans both mentally and physically. It can affect them mentally with sleep disorders and mental health. They are tired, more irritable and less focused. According to the article “Contemporary Sleep Medicine for Patients”, “sleep is defined as a reversible state of reduced responsiveness to the environment” (Iochimescu, 3). There is also such a thing as sleeping too much. This happens when a person sleeps for a long period of time and wakes up still tired. Both not sleeping and sleeping too much can affect a human's health. It is important to know how well an individual sleeps. There are many steps to better sleep. The individual must ensure that they are consistent with the changes. Some changes include going to sleep and waking up at the same time every day, avoiding naps, and creating a bedtime routine (Kiplinger, 1997). Sleep is a very precious thing for humans and there is still a lot of information that researchers have not yet found. It will always be an important topic in a person's life. This is because all humans need sleep to survive. There are many things that can affect your sleep, such as health problems, but there are also many ways that your sleep can affect your health and lifestyle. It's important for people to know how sleep affects them because they are the only person who can improve it and learn from it. Humans sleep to have a healthy immune system, a healthier mind, and a healthier mind