noun
Refers to a frightening dream, often with a supernatural or oppressive feeling. More literary than 悪夢.
彼は夢魔にうなされて飛び起きた。
He woke up with a start, tormented by a nightmare.
noun
incubus; succubus; dream demon
A demon or spirit that appears in dreams, often with sexual connotations. Used in folklore, fantasy, and occult contexts.
その物語では、夢魔が眠っている人のもとに現れる。
In that story, a dream demon appears to a sleeping person.