A type of evil spirit formerly thought to sit on the chest of a sleeping person; also, the feeling of suffocation felt during sleep, attributed to such a spirit.
A demon or monster, thought to plague people while they slept and cause a feeling of suffocation and terror during sleep.
Sleep paralysis.
A very bad or frightening dream. Example: I had a nightmare that I tried to run but could neither move nor breathe.
Any bad, miserable, difficult or terrifying situation or experience that arouses anxiety, terror, agony or great displeasure. Example: Cleaning up after identity theft can be a nightmare of phone calls and letters.
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