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insomnia
(redirected from Inability to sleep)

   Also found in: Medical, Encyclopedia, Wikipedia 0.02 sec.

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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Indicators: rapid speech; visual or auditory hallucinations, delusions, delirium, mania, extreme agitation, inability to sleep, irrational speech or behavior; paranoia
Last year, he had to turn back before beginning his ascent due to his inability to sleep for eight days straight.
The inability to sleep is related to the effects of drugs on nor-epinephrine and serotonin levels, and severe sleep deprivation can be deadly.
 
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