1996-07-07. |access-date= requires |url= (help) ↑ Ernsting, Michele (2004) "Hags and nightmares: sleep paralysis and the midnight terrors" Radio Netherlands ↑ The "Old Hag" Syndrome from About: Paranormal Phenomena ↑ Ghosts, Helpful and Harmful by Elliott O'Donnell ↑ Introduction to Folklore by Marian Roalfe Cox ↑ The History and Antiquities of the Parish of Darlington, in the Bishoprick by William Hylton Dyer Longstaffe, 1854 1 2 The Nineteenth century and after, Volume 68, Leonard Scott Pub.