Thanks for info Doug, I love what that son of The Enlightenment, President Jefferson said;
"It is between fifty and sixty years since I read it [the Apocalypse], and I then considered it merely the ravings of a maniac, no more worthy nor capable of explanation than the incoherences of our own nightly dreams."
-Thomas Jefferson, letter to General Alexander Smyth, Jan. 17, 1825
Of course Revelation was before Freud and Jung when an explanation for types of dreaming could be given but it was written however at a time when opium was known to be used.