Insomnia is a disorder that's defined as not getting enough sleep for normal daily function, despite having had adequate opportunity for sleep. People with insomnia have difficulty falling asleep, staying asleep, waking too early and sleeping soundly.
Many people have insomnia at some point in their lives. But some people have long-term (chronic) insomnia that interferes with their quality of life. Insomnia may be the primary problem or it may be secondary, due to other causes, such as a disease or medication.
Read more about insomnia.
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