Throughout history and throughout the world, people have reported sexual contact with various supernatural creatures. Many people believe that “sex demons” were born out of the need to explain topics that are generally considered taboo. Usually, unintended pregnancy, miscarriage and promiscuity can cause anger and persecution.
Originating from Teutonic or German folklore, an Alp is a small, elf-like creature who is said to have climbed onto a sleeping victim’s chest, turned into a fine mist, and entered the body through the nostrils, mouth, or vagina. Once inside, the Alp had the ability to control its victim’s dreams, creating horrible nightmares. Its victims reported a breathless feeling when they awoke.
This may have been an early explanation for sleep apnea and other sleep disorders.