Should school start later? Some think we are setting teenagers up to fail with early hours in the classroom. There is a growing campaign to start lessons later.
Lack of sleep is a health crisis says expert
You snooze, you lose? : Experts are describing teen sleep deprivation as an “epidemic". Glossary
Experts - Someone who knows a lot about a particular subject.
Blame - Responsible for a bad thing happening.
Hormone - Chemicals carried in the bloodstream that alter the way your body's systems act.
Delay - When something happens later than it was planned.