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A nightmare is a dream that can cause a strong negative emotional response from the mind, typically fear and/or horror. 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.Nightmares can have physical causes such as sleeping in an uncomfortable or awkward position, having a fever, or psychological causes such as stress and anxiety. Eating before bed, which triggers an increase in the body's metabolism and brain activity, is a potential stimulus for nightmares.Fearfulness in waking life is correlated with the incidence of nightmares.Screaming is also a common feature of nightmares, more often than crying or moaning.The whole situation of screaming or crying can happen from 5 to 20 minutes.