in·cu·bus n. an evil spirit supposed to descend upon and have sexual intercourse with women as they sleep.
Synonyms: daemon, daimon, demon, devil, fiend
Etymology: c.1200, from Late Latin (Augustine), from Latin incubo "nightmare, one who lies down on (the sleeper)," from incubare "to lie upon" (see incubate). Plural is incubi. In the Middle Ages their existence was recognized by law.
Like Eurythmics, also a band.