One of the mysteries of the English language finally explained.
The state of wakefulness or sleeplessness; insomnia, (in later use) especially when severe and due to a disorder of or injury to the brain; an instance of this.
Mid 17th century; earliest use found in George Thomson (1619–1677), physician. From post-classical Latin agrypnia from ancient Greek ἀγρυπνία sleeplessness, wakefulness, time of watching, in Byzantine Greek specifically denoting the Easter vigil from ἄγρυπνος wakeful + -ία.
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