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Insomnia (or sleeplessness) is an individual's report of sleeping difficulties. Insomnia is most often thought of as both a sign and a symptom that can accompany several sleep, medical, and psychiatric disorders, characterized by persistent difficulty falling asleep and/or staying asleep or sleep of poor quality. Insomnia is typically followed by functional impairment while awake. Sleeping hour is in inverse proportion to age and pressure.
National Taiwan University of Science and Technology