A Treatise on the Incubus, or Night-Mare, Disturbed Sleep, Terrific Dreams and Nocturnal Visions. John Augustine Waller

ii. Cap. xxviii. De Incubo et Catalepsi. Unknown it could not be to such observers of nature, although they may not have written upon it. In the book however, ascribed to Galen, entitled “De Utilitate Respirationis,” the following short, but comprehensive notice, is to be found concerning it.—Et Ephialtes quædam Epilepsia, quæ fit in somno: fit autem ex mistione tanquam Epilepsia. Ideoque non in vigilante, sed in dormiente: ut enim, prædictum est somnus et epilepsia fiunt in eodem loco, et ex simili causâ: unde Aristoteles dicit epilepsiam esse somnum quendam: verum ephialtes longo tempore perdurans in Epilepsiam convertitur.