The experience is surprisingly common: the author estimates that approximately 15 percent of people undergo this event at some point in their lives. Various cultures have their own name for the phenomenon and have constructed their own mythology around it; the supernatural tenor of many Old Hag stories is unavoidable. Hufford, as a folklorist, is well-placed to investigate this puzzling occurrence.
![The Terror That Comes in the Night The Terror That Comes in the Night](https://www.angusrobertson.com.au/images/5218/9780812213058.jpg?width=250)
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