More than 1 in 5 young adults in the United States are using cannabis or alcohol as a sleep aid, new research shows.

Every two years, researchers from the University of Michigan survey 20,000 adults 19 to 30 as part of an ongoing study of health behaviors. MORE: Peanut allergies have declined since doctors began recommending early exposure

The latest findings, published in JAMA Pediatrics , show that 22% of participants either used cannabis or alcohol, or both, to help them fall asleep — habits that can have a series of negative repercussions, the researchers said.

"Using these substances to get to sleep can backfire because they can interfere with the ability to stay asleep and with the quality of sleep," Megan Patrick, the study's principal investigator, said in a news release

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