Difficulty in falling asleep or in staying asleep. About 1 in 3 adults suffer from insomnia at some time in their lives. The most common cause is worry, but other causes include physical symptoms such as a cough or itching or conditions such as restless legs. Environmental and lifestyle factors or misuse of sleeping drugs are also common causes. Insomnia can also be a symptom of a psychiatric illness, such as anxiety and/ or depression. Withdrawal symptoms from antidepressants, antianxiety drugs, sleeping drugs, and some illicit drugs (see drug abuse), may cause insomnia.


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