Which disorders are associated insomnia?

Updated: Sep 11, 2018
  • Author: Jasvinder Chawla, MD, MBA; Chief Editor: Selim R Benbadis, MD  more...
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Despite inadequate sleep, many patients with insomnia do not complain of excessive daytime sleepiness, such as involuntary episodes of drowsiness in boring, monotonous, nonstimulating situations. However, they do complain of feeling tired and fatigued, with poor concentration. This may be related to a physiologic state of hyperarousal (see Pathophysiology). In fact, despite not getting adequate sleep, patients with insomnia often have difficulty falling asleep even for daytime naps.

Insomnia can also be a risk factor for depression and a symptom of a number of medical, psychiatric, and sleep disorders. In fact, insomnia appears to be predictive of a number of disorders, including depression, anxiety, alcohol dependence, drug dependence, and suicide. The annual cost of insomnia is not inconsequential, with the estimated annual costs for insomnia being $12 billion for health care and $2 billion for sleep-promoting agents. [14]

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