A '''nightmare''' is an unpleasant [[dream]] that can cause a strong [[negative]] [[emotional]] [[response]] from the [[mind]], typically fear or [[horror]], but also despair, anxiety and great sadness. The dream may contain situations of [[danger]], discomfort, psychological or physical [[terror]]. Sufferers usually [[awaken]] in a state of distress and may be unable to return to [[sleep]] for a prolonged period of time. | A '''nightmare''' is an unpleasant [[dream]] that can cause a strong [[negative]] [[emotional]] [[response]] from the [[mind]], typically fear or [[horror]], but also despair, anxiety and great sadness. The dream may contain situations of [[danger]], discomfort, psychological or physical [[terror]]. Sufferers usually [[awaken]] in a state of distress and may be unable to return to [[sleep]] for a prolonged period of time. |