More than one in five young adults in the U.S. say they use cannabis or alcohol to help them fall asleep, according to new research from the University of Michigan, which warns the habit may actually worsen sleep quality over time.

By the numbers:

The study, funded by the National Institute on Drug Abuse, found that 22% of Americans aged 19 to 30 reported using cannabis, alcohol, or both to help them fall asleep.

Cannabis was by far the more common choice: 18% of respondents said they used it for sleep, compared to 7% who turned to alcohol. Among those who had used cannabis in the past year, 41% said they did so specifically to help them drift off.

What they're saying:

"Using these substances to get to sleep can backfire because they can interfere with the ability to stay asleep and w

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