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An essential aspect of human health is sleep. Sleep, among others, interacts with the immune system, plays a role in restoring the body's energy, healing and brain function. Insomnia is often noticed in medical practice, is considered a public health problem. Acute sleep deprivation can alter cognitive performance, and chronic sleep deprivation can lead to disease development. Lack of sleep affects all major systems in the human body, and the major changes that occur in chronic insomnia have been associated with many conditions such as type 2 diabetes, cardiovascular disease, asthma, thyroid disease and gastroesophageal reflux disease.