More Than 8 Million Americans Sleepwalk, Surprising Scientists

By Stephanie Pappas, LiveScience Senior Writer | LiveScience.com

Adult sleepwalkers are more common than previously realized, with upward of 8 million American adults prone to nighttime ambulation, a new study finds.

In fact, about 3.6 percent of U.S. adults have walked in their sleep at least once in the previous year, researchers report Monday (May 14) in the journal Neurology. One percent experienced at least two episodes of sleepwalking per month.