Long ago a co-worker revealed a persisting nightmare which caused her to awake, screaming in panic, several times a week: that she was being held down by her wrists and sexually abused. This happened to her repeatedly when she was a child. Upon awakening there would be marks on her wrists where, in the dream, the attacker held her down. As I never tire of repeating: the unconscious mind is powerful and one must respect its power.