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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.
National Taiwan University of Science and Technology
National Taiwan Universty of Science and Technology