nightmare

A dream arousing feelings of intense fear, horror, and distress.

An event or experience that is intensely distressing.

A demon or spirit once thought to plague sleeping people.

An incubus or evil spirit that oppresses people during sleep.

An oppressed state during sleep, accompanied by a feeling of intense fear, horror, or anxiety, or of inability to escape from some threatened danger or from pursuing phantoms or monsters. Also called incubus.

Any overpowering, oppressive, or stupefying influence.

A fiend or incubus formerly supposed to cause trouble in sleep.

A trerrifying or oppressive dream characterized by a sense of helplessness in the face of danger, extreme uneasiness or discomfort (as of weight on the chest or stomach, impossibility of motion or speech, etc.) or extreme anxiety, from which one wakes in a troubled state of mind.

Any overwhelming, oppressive, or terrifying experience resembling a nightmare{2} especially in the inability to escape from an unpleasant situation.

A female demon or monster, thought to plague people while they slept and cause a feeling of suffocation and terror during sleep.