Insomnia definition

ĭn-sŏmnē-ə
Insomnia is defined as an ongoing inability to sleep or stay asleep.

When you have trouble falling asleep even though you are tired, this is an example of insomnia.

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Chronic inability to fall asleep or remain asleep for an adequate length of time.
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Chronic inability to fall asleep or remain asleep for an adequate length of time.
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Chronic inability to fall asleep or remain asleep for an adequate length of time.
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A sleeping disorder that is known for its symptoms of unrest and the inability to sleep.
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Abnormally prolonged inability to sleep, esp. when chronic.
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Other Word Forms

Noun

Singular:
insomnia
Plural:
insomnias

Origin of insomnia

  • Latin īnsomnia from īnsomnis sleepless in- not in–1 somnus sleep swep- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Latin in- (“without”) +‎ somnus (“sleep”) +‎ -ia.

    From Wiktionary