Texting behind the wheel. Drunken driving. Skimping on sleep. For teens, these are dangerous bedfellows.

New research finds that compared to high-schoolers who typically get nine hours of sleep, those who get less shut-eye are more likely to drink and drive, text while driving, hop in a car driven by a driver who’s consumed alcohol, and leave their seatbelts unbuckled.

But while dangerous behaviors escalated with less sleep, too much sleep also was linked to risk-taking in teens: among those who routinely slept more than 10 hours per night, on average, researchers also noted higher rates of drinking and driving, infrequent seatbelt use, and riding with a driver who had consumed alcohol.

The National Sleep Foundation that adolescents 14-to-17 years old get eight-to-10 hours of sleep per night. But a majority falls well short of that goal. Girls were less likely to get enough sleep than boys (71 percent vs. 66.4 percent). And 75.7 percent of Asian students were most likely among the ethnicities surveyed to report insufficient sleep.

In a report released by the Centers for Disease Control and Prevention, researchers culled the survey responses of more than 50,000 teens in grades nine-through-12 between 2007 and 2013. The teens were presented a range of risk-taking behaviors and asked whether they had engaged in any in the past 30 days. They were also asked about their average sleep duration and other health-related behaviors.

Among adolescents, two-thirds of all fatalities are related to traffic crashes. Sleepiness impairs a teen’s attention and reaction time behind the wheel, which is bad enough. But the authors of the new report suggest that chronic sleep shortage might also be linked to poor judgment or a “likelihood to disregard the negative consequences” of taking chances.

Compared to a teen getting the recommended nine hours of sleep nightly, a high schooler reporting six hours of sleep per night was 84 percent more likely to say he or she had driven after consuming alcohol in the past 30 days, 92 percent more likely to report infrequent seatbelt use in car, and 42 percent more likely to acknowledge he or she had ridden in a car with a driver who consumed alcohol in the past month.

Teens who reported sleeping five hours or less per night were more than twice as likely as their well-rested peers to acknowledge drinking and driving and infrequent seatbelt use.

In the case of teens who sleep 10 hours or more per night, the researchers suggested that depression might be the best explanation for greater risk-taking.

Fewer than 30 percent of teens surveyed reported nightly sleep duration between eight and nine hours. Roughly 30 percent reported sleeping an average of seven hours nightly, with about 22 percent reporting six hours’ sleep nightly and 10.5 percent reporting five hours. Only 1.8 percent of teens reported they slept 10 or more hours nightly.

Teens’ average propensities to engage in risky behavior were not reassuring: on average, 26 percent reported they had ridden in a car with a driver who had drunk alcohol at least once in the past 30 days; 30.3 percent reported they had texted while driving at least once in the past 30 days; 8.9 percent reported drinking and driving in the past 30 days, and 8.7 percent reported infrequent seatbelt use. Fully 86.1 percent reported they wore a bicycle helmet infrequently while riding a bike.

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©2016 Los Angeles Times