A spirit that arouses feelings of intense horror and distress in sleeping persons, often accompanied by a sense of suffocation. From Middle English night + mare. c.1290. images

Ardat Lili: A succubus or a young female spirit associated with children and pregnant women, also a storm demon. One in the demon-triad formed by Lilu (the male), Lilitu (the female), and Ardat Lili (the handmaid). (Sumerian)

Batibat: A female nightmare demon that causes death during sleep, associated with trees. (Philippine)

Hantu Kopek: Female nightmare demon. (Malaysian)

Irdu Lili: An incubus, the male equivalent of Ardat Lili. (Sumerian)

Incubus: A male demon that attempts sexual intercourse with sleeping persons. From Late Latin incubāre to lie upon, from Latin incubō nightmare, demon who lies down on the sleeper. c.1205. image

Lilu: An incubus.

Succubus: A female demon that attempts sexual intercourse with sleeping persons. From Latin succubāre to lie under, alteration of Late Latin incubus. 1387. image