A nightmare is an unpleasant dream that can cause a strong emotional response from the mind, typically fear or horror, but also despair, anxiety and sadness. The dream may contain situations of danger, discomfort, psychological or physical terror. Sufferers often awaken in a state of distress and may be unable to return to sleep for a prolonged period. The word derives from the Old English "mare", a mythological demon or goblin who torments others with frightening dreams.
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