A medical condition characterized by prolonged inability to sleep or complete wakefulness, often used in historical medical texts.
From Greek 'agrypnos' meaning sleepless, derived from 'a-' (without) and 'hypnos' (sleep). The term entered medical terminology in the 16th century through Latin medical texts and was used to describe severe insomnia.
Ancient Greek physicians used this word to describe a symptom they associated with fevers and mental anguish—long before we understood sleep science, people recognized that losing sleep could be as dangerous as losing blood.
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