Koreatimes iconKoreatimesSep 3, 2026 ~1 min source read

Should middle and high schools start after 8:30 a.m.?

As adolescents go through puberty, the timing of melatonin release — the hormone that promotes sleep — tends to shift later. As a result, teenagers often find themselves falling asleep and waking up later.

Should middle and high schools start after 8:30 a.m.?

Share this story

Send the public story page.

Useful takeaways from this story.

As adolescents go through puberty, the timing of melatonin release — the hormone that promotes sleep — tends to shift later.

As a result, teenagers often find themselves falling asleep and waking up later.

However, when schools start early in the morning, adolescents are often required to wake up earlier than their natural body clocks would prefer.

Building the complete brief

The page is ready to read now. The fuller skim-friendly version will appear here automatically.

The useful part

As adolescents go through puberty, the timing of melatonin release — the hormone that promotes sleep — tends to shift later. As a result, teenagers often find themselves falling asleep and waking up later. However, when schools start early in the morning, adolescents are often required to wake up earlier than their natural body clocks would prefer.

How it works

  • A recent study published in the international journal Sleep Medicine Reviews found that this difference in sleep schedules between weekdays and weekends, known as "social jetlag," is associated with anxiety...

Details worth keeping

This is one reason why many teenagers sleep late on weekends.

Keep reading in the app

Open the app view to save this story, compare related coverage, and continue from the same source.

Open in app