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Encyclopedia Britannica - Main :: I27-INV |
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INSOMNIA , or deprivation of sleep (Lat. somnus), a common and troublesome feature of most illnesses, both acute and chronic. It may be due to pain, fever or cerebral excitement, as in delirium tremens, or to organic changes in the brain. The treatment, when failure to sleep occurs in connexion with a definite illness, is part of the treatment of that illness. But there is a form of sleeplessness not occurring during illness to which the term
minor discomfort, such as indigestion, nor with the " bad nights " of the valetudinarian. Real insomnia consists in the prolonged inability to obtain sleep sufficient in quantity and quality for the maintenance of health
condition of modern urban life, and may be regarded as a malady in itself. It is a potent factor in causing those nervous
nervous
system
long after convalescence. But it very often occurs without any such cause. Professional and business men are the most frequent sufferers. Insomnia is comparatively rare among the poor, who do little or no brain work
long -continued worry, or by sheer overwork. The broad pathology
function
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