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Nowadays, a high percentage of the population in modern society suffers from various kinds of sleep disturbances, due to the impact of increased physiological and socio-cultural stress factors. One of the most common sleep complaints, which the human being has suffered from since ancient times, is insomnia. Although its literal meaning is a total lack of sleep, in clinical and practical terms insomnia has come to refer to a difficulty in initiating and/or maintaining sleep, or non-restorative, non-refreshing sleep. In a survey conducted in the general population of different countries, the prevalence of insomnia was estimated to be about one third of the adult population.