Dr. Jason Nagata
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The study included more than 650 teens who downloaded an app on their smartphone, allowing researchers to passively monitor their phone use.
Study author Dr. Jason Nagata is a pediatrician at the University of California, San Francisco.
He says on average, teens spend more than 50 minutes on their phones between 10 p.m.
And nearly half were on their phone at some point between midnight and 4 a.m.
He says 65% of weeknight screen time was spent on social media apps like TikTok, Instagram and YouTube.
A smaller share was spent on entertainment apps and video games.
The results appear in JAMA Pediatrics.
The study included more than 650 teens who downloaded an app on their smartphone, allowing researchers to passively monitor their phone use.
Study author Dr. Jason Nagata is a pediatrician at the University of California, San Francisco.
He says on average, teens spend more than 50 minutes on their phones between 10 p.m.
And nearly half were on their phone at some point between midnight and 4 a.m.
He says 65% of weeknight screen time was spent on social media apps like TikTok, Instagram and YouTube.
A smaller share was spent on entertainment apps and video games.
The results appear in JAMA Pediatrics.