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Insomnia sleep disorder is more prevalent in Western society, defined as difficulty initiating of falling or staying asleep, it is the most common disorder of all partners to sleep. Epidemiological studies suggest, that between 30-35% of the population experiences episodes insomniacs. Occasionally, it affects one third of the adult population and as a chronic disease epidemiological percentage reaches 10% of adults. 10-15% of these problems arising from an inability to sleep are a chronic and very serious problem, because the consequences connected with the illness interfere with the normal development of their daily lives. The condition occurs more frequently in women and elderly. The entries on episodes of insomnia are the second most frequent subjective complaint of patients after pain.
Defined clinical entities under this section are presented in different aspects, difficulty falling asleep (sleep onset), difficulty falling asleep (when the difficulty is stretched over 30 minutes of sleep latency), or deprivation in developing sleep or during the course of it, with waking up early before the scheduled time and feeling little restful sleep. The lack of sleep during the night described a daytime symptomalogy in insomnia subjects, that is always repeated in some of these situations: daytime fatigue, mood swings, low work or school performance, lack of motivation, difficulty concentrating on the functions developed during the day and excessive daytime sleepiness. A sleepless night is not indicative enough for diagnosis of insomnia, it requires the presence of this symptomatic picture repeated to establish a clinical report.
The difficulties in the development of sleep should be recurrent and continuous in the time to consider insomniacs and pathological events. Insomnia may appear as an entity in itself, isolated from external circumstances (primary insomnia) or as a symptom of an underlying disorder, side effects or clinical signs of other diseases or medical conditions and personal (secondary insomnia)ones.