POWs from World War II and concentration camp survivors have been known to suffer post-traumatic stress nightmares for up to fifty years after the event. Unlike ‘normal’ nightmares, these dreamers can experience significant physical symptoms during REM sleep and non-REM sleep, such as an increase in respiration and heart rate, muscle twitches and more than one arousal. Adults might experience other traumatic events in their lives, such as the loss of a loved one or bankruptcy, and these events can also continue to play out in dreams over the years in the form of nightmares. The more standard anxiety nightmare dreamers, however, have nightmares that relate to work, school or relationship stresses. The threat here isn’t to your life but to your self-confidence and sense of self.