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Hi Susan Cody
Although German scientists Wilhelm Wundt thought that dreams were caused by stimulation of palpitations, abdominal distensions, urgent urinations and other objective things, he did not clearly indicate nightmares were caused by palpitations, and even did not give a satisfactory and convincing explanation to the reasons for nightmares. In addition, he did not have any mysterious insights, unlike the Freud's mysterious theory of dream without scientific basis as well as Freud's popularity due to capturing people's curiosities, his correct opinions failed to receive wide attention. A paper published in Chinese Scientists 1996 proposed that nightmares were caused by palpitations, and the two most common nightmares were caused by the two most common reasons of palpitations. After giving satisfactory explanations to nightmares, someone from another country also published papers online in 2002,and proposed that nightmares were caused by palpitations（ http://boards.straightdope.com/sdmb/archive/index.php/t-145666.html）. However, he also did not give any further satisfactory explanation, so his correct opinions also failed to receive wide attention.