New research finds age 13 is a turning point when bedtime screen use spikes, cutting into the sleep adolescents need most as they gain access to social media platforms.
For many kids, turning 13 is a milestone that comes with more freedom, but it also brings a hidden cost. New research shows that once teens are old enough to officially sign up for social media platforms, their bedtime routines shift in ways that cut into the sleep they need most.
The study, published in Sleep Health: Journal of the National Sleep Foundation, analyzed more than 10,000 adolescents between ages 12 and 13. Researchers found that as soon as teens gained access to apps like TikTok, Instagram, and Snapchat, their screen time in bed increased significantly — and their sleep paid the price.More than 70% of adolescents in the study had a device in their bedroom. As they aged within that one-year window, they became more likely to watch videos, check social media, or text while in bed.Researchers found clear patterns in how often teens used screens at night:Each of these behaviors was linked to less restful sleep, and the interruptions often carried into the night. About one in four teens reported being woken up by calls, texts, or emails, and many admitted to picking up their devices again after waking.The research is part of the Adolescent Brain Cognitive Development project, one of the largest ongoing studies of youth in the United States. The team said they expected screen use to increase around 13 because most major platforms set that as the minimum sign-up age.Peer pressure and fear of missing out also intensify during this stage of adolescence, making it harder for teens to put their phones away at bedtime.Not all teens used screens in the same way. The study found:Doctors say puberty naturally shifts teens toward later bedtimes, already making it harder to get enough rest. Adding late-night screen use makes the problem worse, and consistent sleep loss can affect school performance, mental health, and long-term well-being.Researchers recommend pediatricians and educators give "anticipatory guidance" — advice before problems take hold — about screen limits at bedtime. Family media plans, such as those promoted by the American Academy of Pediatrics, may help set boundaries, but experts caution that one-size-fits-all rules are unlikely to work.Community programs, culturally relevant messaging, and safe alternatives for evening activities may be more effective in helping families protect teen sleep.
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