I once heard of a psychoanalyst who was famous for his parting ritual. He would shake a person's hand and say, "May you have a good nightmare!" This odd-sounding goodbye reflected his belief that only when we are pushed to the wall by our pain from within, will we face the unresolved issues that reside under the surface of our defenses. The sufficiently painful "nightmare" that demands our attention to wake up is also our greatest ally, as it signals the beginning of this journey.
-- Eleanor D. Payson, The Wizard of Oz and Other Narcissists, p. 84