What goes bump in the night? In many U.S. households: people. That's according to new Stanford University School of Medicine research, which found that about 3.6 percent of U.S. adults - or upward of 8.4 million - are prone to sleepwalking. The work also showed an association between nocturnal wanderings and certain psychiatric disorders, such as depression and anxiety. The study, the researchers noted, "underscores the fact that sleepwalking is much more prevalent in adults than previously appreciated...

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