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Encyclopedia Britannica



INSOMNIA

This article appears in Volume V14, Page 644 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: I27-INV
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
  " insomnia " is commonly and conveniently applied. It must not be confounded with occasional wakefulness caused by some
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
 . It is a
condition
  of modern urban life, and may be regarded as a malady in itself. It is a potent factor in causing those
nervous
  breakdowns ascribed to " overwork." It may occur as a sequel to some exhausting illness, notably influenza, which affects the
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
 . It may be brought on by some exceptional strain, by
long
 -continued worry, or by sheer overwork. The broad
pathology
  is simple enough. It has been demonstrated by exact observations that in sleep the blood leaves the brain automatically. The
function
  is rhythmical, like all the vital functions, and the mechanism by which it is


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