I did it from memory. Here's the WP version. If you have no standards for testing claims of superhuman origin, you won't have a defense against either human or superhuman deception:

William S. Sadler and his wife Lena Sadler, physicians in Chicago and well known in the community, are said to have been approached as early as 1911 by a neighbor who was concerned because she would occasionally find her husband in a deep sleep and breathing abnormally.[11][12] She reported that she was unable to wake him at these times. The Sadlers came to observe the episodes, and over time, the individual produced verbal communications that claimed to be from "student visitor" spiritual beings.[13][12] This changed sometime in early 1925[13] with a "voluminous handwritten document," which from then on became the regular method of purported communication.[13][14] The individual was never identified publicly but has been described as "a hard-boiled business man, member of the board of trade and stock exchange."[12]