Plural form of agrypnia; multiple instances or cases of prolonged sleeplessness.
Greek plural form of agrypnia, following classical Greek noun declension patterns where -a nouns form plurals with -ai. This appears primarily in historical medical and philosophical texts.
This is a ghost word in English—it shows up in old medical dictionaries but nobody really uses the plural anymore because modern doctors just say 'cases of insomnia' instead.
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