"Hag" as a noun meaning "a repulsive old woman" comes from Old Englishhægtes, "witch, fury," appearing in the early 1200s. Other noun meanings include "an amount of manual work" appearing in 1797; "a pit in the ground" appearing in the early 1400s; and "a large type of seagoing vessel" appearing in 1725. As a verb, "hag" can mean "to cut or chop roughly" (1294) and "to torment or trouble" (1525). A "night hag" is a supernatural creature associated with sleep paralysis; it was said to sit on a person's chest at night, preventing that person from breathing. Links.NightCafe Image Source