MPs have debated about school start times after young people signed a petition.
It takes 100,000 signatures to trigger a Parliamentary debate and this one, saying early school starts make pupils "so tired", has gained 180,000.
New research shows that early starts can affect a teenager's mood, and changing when the school day begins can perk up a teen’s mood, benefit their health and enhance their ability to learn.
When a child’s biological time and school hours are closely aligned, like at the beginning of their school careers, their faculties are not affected. During puberty, shifts in a teen’s bodyclock push the optimal time for sleep later into the evening, making it difficult for most teenagers to fall asleep before 11.00pm.
You can read the transcript from the debate