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'Just go to bed earlier' is the advice that fails most teens — because during puberty the body clock genuinely delays one to two hours, so a 15-year-old trying to sleep at 9pm is fighting real biology, not laziness. Their sleep need also stays high while school starts earlier, creating a built-in deficit that weekend lie-ins only deepen. The workable approach meets the biology halfway: protect morning light, shrink screens, and keep weekends close to weekdays.
Teens are not lazy — their body clock genuinely shifts later during puberty. Working with the biology beats fighting it.
Puberty delays the circadian clock 1-2 hours — melatonin releases later, so early bedtimes are biologically near-impossible regardless of effort.
8-10 hours, at a time when school schedules allow far less — which is why weekend catch-up exists, and why keeping it under 2 hours matters.
Morning light (10 minutes outside), screens down 45 minutes before bed, and weekend wake times within 2 hours of weekday ones.
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