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insomnia
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insomnia

Difficulty in falling asleep and sustaining sleep. Insomnia may be caused by mental or physical factors, with anxiety being the commonest cause. It results in the sufferer feeling perpetually tired. See also sleep disorder.


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Any secondary causes of insomnia should be investigated and treated before a diagnosis of primary insomnia is made.
Apart from poor sleep habits, Brandes noted, major causes of insomnia seem to be psychological distress, such as that seen with anxiety and depression.
This can be a useful guide to well-directed laboratory studies that may yield valuable information about endocrine, cardiovascular, neurologic and respiratory causes of insomnia.
 
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