The Brief

LOS ANGELES - 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

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