insomnia Hear it!

insomnia definition

in·som·nia (in säm′nē ə)

noun

abnormally prolonged inability to sleep, esp. when chronic

Etymology: L < insomnis, sleepless < in-, in- + somnus, sleep: see somnolent

Related Forms:

  • insomniac in·som′·niac′ (-ak′) noun, adjective

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