A study found more adolescents getting less rest because of the pitfalls of mobile technology.

Teens now Sleep less than they normally do, sacrificing sleep time to spend more time on their mobile phones and tablets.

Medical experts say teens needs at least nothing less than nine hours of sleep a night to be engaged and productive during the day. Anything less can cause daytime sleepiness and interfere with school or daily activities.

Plaque with endless number of tempting distractions, how much sleep are today’s teens actually getting? To be certain, researchers studied a pair of long-term, national surveys involving more than 360,000 eighth- through 12th-graders.

One of the survey asked eighth-, 10th- and 12th-graders how frequent they got at least seven hours of sleep. The other asked high school students how long they slept on a typical school night.

In 2015, 4 of every 10 teens slept less than seven hours a night. That’s up 58 percent since 1991 and 17 percent more than in 2009 when smartphone use became more mainstream, the researchers said.

“Teens’ shortage of sleep began just as the majority started using Smartphones. It’s a very suspicious pattern,” said study leader Jean Twenge, a psychology professor at San Diego State University.

The more time students reported spending on the internet, the less sleep they got, according to the study published in the journal Sleep Medicine.

Those who were online five hours a day were 50 percent more likely to be sleep-deprived than classmates who limited their daily time online to an hour.

Studies have shown that light from smartphones and tablets can disrupt the body’s natural sleep-wake cycle.

“Our body is going to work hard to meet its sleep needs, which means sleep is going to interfere or shove its nose in other spheres of our lives,” said study co-author Zlatan Krizan, an associate professor of psychology at Iowa State University. “Teens may catch up with naps on the weekend or they may start falling asleep at school.”

Although smartphones, tablets and other electronic appliances are often an essential part of life, the researchers said moderation is key. Everyone — young and old alike — should limit use to two hours each day, they advised in a San Diego State University news release.

“Stating the importance of sleep for both physical and mental health, both teens and adults should consider whether their smartphone use is interfering with their sleep,” Twenge said. “It’s particularly important not to use screen devices right before bed, as they might interfere with falling asleep.”

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