An anxiety dream is an unpleasant dream which can be more disturbing than a nightmare. Anxiety dreams are characterized by the feelings of unease, distress, or apprehension in the dreamer upon waking. Anxiety dreams occur in rapid eye movement sleep, and usual themes involve incomplete tasks, embarrassment, falling, getting in to legal or financial trouble, failed pursuits and being pursued by another, often times an unrealistic entity but other human beings can also be the pursuer. Anxiety dreams may be caused by childhood trauma, or an adult dealing with conflict. Though they create anxiety in the dreamer, anxiety dreams also serve as a way for a person's ego to re-set.