Nightmare

n. frightening dream; experience suggestive of a nightmare

The current usage of the term nightmare refers to a dream which causes the sleeper a strong unpleasant emotional response. Nightmares typically feature fear or horror, and/or the sensations of pain, falling, drowning or death. They can be related to physiological causes, such as a high fever; psychological ones, such as unusual trauma or stress in the sleeper's life; or commonly for no apparent cause. Nightmares can be so stressful as to suddenly wake the sufferer in a state of distress, which may prevent falling back to sleep for some time.
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...nightmare is the fourth release for the Italian hardcore punk band Negazione.
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Nightmare /night·mare/ a terrifying dream, usually awakening the dreamer. night·mare n. 1. A dream arousing feelings of intense fear, horror, and [more]Nightmare - Community and Resources

Noun
1. a situation resembling a terrifying dream
(synonym) incubus
(hypernym) situation
2. a terrifying or deeply upsetting dream
(hypernym) dream, dreaming

(n.)
Hence, any overwhelming, oppressive, or stupefying influence.
  

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

(n.)
A condition in sleep usually caused by improper eating or by digestive or nervous troubles, and characterized by a sense of extreme uneasiness or discomfort (as of weight on the chest or stomach, impossibility of motion or speech, etc.), or by frightful or oppressive dreams, from which one wakes after extreme anxiety, in a troubled state of mind; incubus.