Night Demons is a term used to describe two supernatural creatures, Incubi and Succubi. Incubi are male demons that appear in the form of a human and visit people in their sleep, usually to seduce them. They are believed to be responsible for unwanted sexual encounters and nightmares. Succubi are female demons that also visit people in their sleep, but instead of seducing them, they drain their energy and life force. Both Incubi and Succubi are considered to be Night Demons.