What is insomnia? Insomnia is the condition of being unable to sleep. People with insomnia, may be plagued by trouble falling asleep,unwelcome awakenings during the night, and fitful sleep. They may experience daytime drowsiness yet still be unable to nap, and are often anxious, irritable, and unable to concentrate.Insomnia is one of the most common types of sleep disturbance,at least occasionally affecting about one in three people
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