"Teens are just tired" isn't really an explanation. It's a symptom. Here's what's actually going on with teen sleep, backed by the CDC and the Sleep Foundation, not a wellness influencer.
Teens between 13 and 18 need 8 to 10 hours of sleep a night. Not as a nice-to-have, but as a baseline for the brain and body to actually function.1
Sleep isn't downtime. During the teen years especially, quality sleep supports major brain, physical, social, and emotional development. It's directly tied to attention, memory, and the ability to think things through, not just "feeling less tired."1
Light exposure in the evening, mainly from screens, is one of the biggest disruptors. Teens exposed to more light at night are measurably less likely to get enough sleep.2 An inconsistent bedtime does similar damage: teens with a parent-set, consistent bedtime get meaningfully more sleep than those without one, which suggests structure matters more than willpower here.2
The CDC and Sleep Foundation's actual recommendations, in order of evidence:
Same time, every day. Going to bed and waking up at consistent times, yes, even on weekends, is one of the most reliable levers.2
Screens off 30 minutes before bed. Turning off phones and other electronics at least half an hour before sleep measurably helps, and keeping devices out of the bedroom entirely helps more.2
Room set-up. Cool, quiet, and dark beats a bright, noisy room every time.3
Watch caffeine timing. Caffeine in the afternoon or evening, and large meals right before bed, both make it measurably harder to fall asleep.2