Sleep disturbance, or insomnia, is a generalized term that implies poor falling asleep, problems with maintaining sleep and waking up too early. As a result, a person cannot fully recover strength and performance during sleep, which reduces the quality of life. Sleep disturbance occurs to some degree in almost half of the adult population, but only in 9-15% of people this problem becomes clinically significant. Chronic insomnia is much more common in the elderly than in the young – more than 55% of cases.
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