(CBS News) – Sleepwalking is much more common in the U.S. population that previously thought, researchers announced Monday.

In a new study, published in the May 15 issue of the journal, Neurology, researchers found about 3.6 percent of U.S. adults – about 8.4 million people – sleepwalk each year. What’s more, almost 30 percent of adults said they’ve strolled while snoozing at least once throughout their lifetime.

Previous estimates of sleepwalking prevalence were around 2 percent, with U.S. estimates dating back 30 years since they were last updated.

Sleepwalking, or somnambulism, is a disorder that occurs when people walk or do another activity while they are asleep. It most often occurs during deep, non-REM (rapid eye movement) sleep early in the night, but can occur during REM sleep closer to the morning.

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