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insomnia

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in⋅som⋅ni⋅a

[in-som-nee-uh]
–noun
inability to obtain sufficient sleep, esp. when chronic; difficulty in falling or staying asleep; sleeplessness.

Origin:
1685–95; < L, equiv. to insomn(is) sleepless (in- in- 3 + somn(us) sleep + -is adj. suffix) + -ia -ia


in⋅som⋅ni⋅ous, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2010.
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Insomnia Facts
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Insomnia
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www.Insomnia-Resource.com
in·som·ni·a   (ĭn-sŏm'nē-ə)   
n.  Chronic inability to fall asleep or remain asleep for an adequate length of time.

[Latin īnsomnia, from īnsomnis, sleepless : in-, not; see in-1 + somnus, sleep; see swep- in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Cultural Dictionary

insomnia [(in-som-nee-uh)]

A persistent and prolonged inability to sleep.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

insomnia 
1623, Anglicized as insomnie, from L. insomnia "want of sleep," from in- "not" + somnus "sleep" (see somnolence). The modern form is from 1758. Insomniac (n.) is from 1908.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: in·som·nia
Pronunciation: in-'säm-nE-&
Function: noun
: prolonged and usually abnormal inability to obtain adequate sleepcalled also agrypnia
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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insomnia in·som·ni·a (ĭn-sŏm'nē-ə)
n.
Chronic inability to fall asleep or remain asleep for an adequate length of time.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Science Dictionary
insomnia   (ĭn-sŏm'nē-ə)  Pronunciation Key 
Chronic inability to fall asleep or remain asleep for an adequate length of time.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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