Brewer's: Alnaschar of Modern Literature
Coleridge has been so called because he “dreamt” his Kubla Khan, and wrote it out next morning. (1772–1834.)
Probably he had been reading Purchas's Pilgrimage, for none can doubt the resemblance of the two pieces.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894