New research finds that social media is disrupting the sleep of teenagers, according to The Huffington Post.

What did the researchers find? Waking up at night to use social networking platforms like Snapchat and Instagram was surprisingly common. Twenty-two percent of 12- and 13-year-olds and 23 percent of 14- and 15-year-olds said they “almost always” did so. More than a third said they did at least once a week.

This behavior seems to take a real toll. More than half of the heavier nighttime social media users said they usually go to school feeling tired.

“In turn, we find a significant association between feeling tired when they go to school and their overall levels of subjective well-being,” Dr. Chris Taylor, a researcher at Cardiff and one of the study’s authors, added in an email to The Huffington Post.

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