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Insomnia is an inability to sleep well. It's a common problem, affecting almost everyone at one time or another. A person with insomnia may have difficulty falling asleep or staying asleep, wake up frequently during the night, or wake up earlier than desired the next morning, resulting in symptoms such as daytime fatigue, irritability, poor memory, loss of productivity, and decreased enjoyment of family and social life.
Most people have an occasional restless night, often related to short-term stress. For some people, however, poor-quality sleep is a recurring or even a lifelong problem. Temporary insomnia, lasting days to weeks, affects about 50% of adults. Insomnia that lasts more than 6 weeks may affect up to 10% to 15% of adults.
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