Each of the following sentences is followed by four words or group of words. Fill in the blanks with the appropriate word or group of words.
She had a terrible night caused by a(n)_____ during her sleep.
Correct Answer : A.
An incubus is a male devil supposed to have sex with a sleeping woman. Broadly, incubus means a very worrying problem. In literary usages, as in the given sentence, it means a bad dream and is synonymous with incubus.