Insomnia, or sleeplessness, is a sleep disorder in which there is an inability to fall asleepor to stay asleep as long as desired.While the term is sometimes used to describe adisorder demonstrated by polysomnographic evidence of disturbed sleep, insomnia is often practically defined as a positive response to either of two questions: "Do you experience difficulty sleeping?" or "Do you have difficulty falling or staying asleep?"
-Wikipedia.org
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