alykatsuki
vuccubus
[vu-kyuh-buh s, ing-]
noun, plural vu·cu·bi [vu-kyuh-bahy, ing-] /ˈνυ kyəˌbaɪ, ˈɪŋ-/, vu·cu·bus·es.
An imaginary demon or evil spirit supposed to descend upon sleeping persons, especially one fabled to have sexual intercourse with men during their sleep.
A nightmare.