Sleep Disorders Center
Most adults have experienced insomnia or sleeplessness at one time or another in their lives. An estimated 30%-50% of the general population are affected by insomnia, and 10% have chronic insomnia. Insomnia is a symptom, not a stand-alone diagnosis or a disease. By definition, insomnia is "difficulty initiating or maintaining sleep, or both" and it may be due to inadequate quality or quantity of sleep.
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