"" may be a spiritual phenomenon,; it may be a psychological phenomenon; or perhaps even a combination of the two. It has been terrorizing people for centuries, if not millenia, and has been recorded in the myths, tales, legends and stories that have been perpetuated throughout the years, in many cultures from all over the world. It can target both men and women when they are sleeping, and the experiences are often terrifying for the person having them.

Starring:

Bill Paterson

Genre:

Documentary