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insomnia

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Insomnia is defined as an ongoing inability to sleep or stay asleep.

(noun)

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

See insomnia in Webster's New World College Dictionary

noun

abnormally prolonged inability to sleep, esp. when chronic

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

Related Forms:

insomniac noun, adjective

See insomnia in American Heritage Dictionary 4

noun

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

Origin:

Origin: Latin īnsomnia

Origin: , from īnsomnis, sleepless

Origin: : in-, not; see in-¹

Origin: + somnus, sleep; see swep- in Indo-European roots

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