Dictionary

insomnia

noun in·som·nia \in-ˈsäm-nē-ə\

: the condition of not being able to sleep

Full Definition of INSOMNIA

:  prolonged and usually abnormal inability to get enough sleep
in·som·ni·ac \-nē-ˌak\ adjective or noun
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Examples of INSOMNIA

  1. <has suffered from insomnia virtually his entire life>

Origin of INSOMNIA

Latin, from insomnis sleepless, from in- + somnus sleep — more at somnolent
First Known Use: circa 1623

Related to INSOMNIA

INSOMNIAC Defined for Kids

insomnia

noun in·som·nia \in-ˈsäm-nē-ə\

Definition of INSOMNIA for Kids

:  difficulty in sleeping
Medical Dictionary

insomnia

noun in·som·nia \in-ˈsäm-nē-ə\

Medical Definition of INSOMNIA

:  prolonged and usually abnormal inability to obtain adequate sleep—called also agrypnia

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