[], (Noun)

Definitions:
- 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.


Phrases:

Origin:
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