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High Quality Content by WIKIPEDIA articles! A nightmare, also known as a "bad dream", is an unpleasant dream. Nightmares cause strong unpleasant emotional responses from the sleeper, typically fear or horror. The dream may contain situation(s) of danger, discomfort, or psychological or physical distress. Such dreams can be related to physical causes such as a high fever; in an uncomfortable or awkward position; stress or post-traumatic experiences. Sometimes there may not readily be an explanation. Sleepers may be woken in a state of distress, and be unable to get back to sleep for some time. Eating before bed, which triggers an increase in the body's metabolism and brain activity, is another potential stimulus for nightmares. The term "nightmare" refers to what was called Sleep Paralysis in the 19th century and earlier.