insomnia

insomnia definition - medical

in·som·ni·a (ĭn-sŏmˈnē-ə)

noun
Chronic inability to fall asleep or remain asleep for an adequate length of time.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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