It’s a familiar scene in many families: a teen who stays up past midnight and can’t wake up for school in the morning. Parents may blame it on laziness or too much screen time, but scientists say there’s much more going on.
The Teen’s Body Clock
During adolescence, the body’s circadian rhythm—the body’s natural 24-hour clock—shifts. Instead of producing melatonin, the hormone that signals sleep, around 9–10 p.m. like children, teens’ brains release it much later, often after 11 p.m. This shift makes it biologically harder for them to fall asleep early, no matter how much their parents insist.
Not just gadgets
Of course, late-night TikTok scrolling or gaming marathons don’t help, but even without devices, many teens struggle to fall asleep early. Their bodies are wired for later nights and later mornings. Unfortunately, school schedules rarely align with this natural rhythm, leaving teens chronically sleep-deprived.
Why this matters
Sleep deprivation in teens doesn’t just mean morning grumpiness. Studies have linked poor sleep to:
Decreased concentration and memory
Increased irritability and mood swings
Weakened immune system
Higher risk of anxiety and depression
What parents can do
While school start times may be out of your control, small changes at home can make a big difference:
A consistent routine: Encourage going to bed and waking up at the same time, even on weekends.
A sleep-friendly environment: Keep bedrooms dark, cool, and quiet.
Screen-free rest: Limit phone and computer use for at least an hour before bed.
Morning light: Exposure to natural light in the morning helps reset your body clock.
The big picture
Experts say schools should adjust start times to fit teens’ biology. Until then, understanding that your teen's sleep problems are not due to laziness but to biology can change the family's approach to rest and daily schedule.
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