· A nightmare, also called a bad dream, is an unpleasant dream that can cause a strong emotional response from the mind, typically fear but also despair , anxiety and great sadness . · They often set heart pounding from fear. · The dream may contain situations of discomfort, psychological or physical terror or panic. Sufferers often awaken in a state of distress and may be unable to return to sleep for a short period of time. · Frequent occurrence of nightmares, however, becomes a disorder when it impairs social, occupational, and other important areas of functioning. At this point, it may be referred to as Nightmare Disorder (formerly Dream Anxiety Disorder) or "repeated nightmares," which is a term defined more specifically as a series of nightmares with a recurring theme. · Nightmares, which tend to be more common in girls than boys, usually begin in childhood before age 10 and are considered normal un