incubus
/ˈɪŋ.kjʊ.bəs/noun
High School
1
An evil spirit supposed to oppress people while asleep, especially to have sex with women as they sleep.
2
A feeling of oppression during sleep, sleep paralysis; night terrors, a nightmare.
3
Any oppressive thing or person; a burden.
4
One of various of parasitic insects, especially subfamily Aphidiinae.