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Can't get him out of bed in the morning

The same teenager, wide awake at eleven at night

His body clock shifts at puberty

The sleep hormone, melatonin, reaches him one to three hours later

Before eleven, the signal isn't there

His need doesn't drop: eight to ten hours

Asleep at midnight, he'd wake around nine

School rings at eight

On weekdays, the deficit deepens

At weekends, sleeping in repays it

Several countries have pushed back the first lesson, and results followed

What he's blamed for is exactly what repairs him