Early to bed...early to rise...

It is always the fault of the school...

The early start to classes causes American teenagers to lose much needed sleep that puts them at risk of becoming moody and performing poorly in school, researchers said on Monday.

A survey of students aged 12 to 15 years old found they lost an average of two hours of sleep on the nights before a school day, affecting their work and alertness in class.

So, what happened to 'going to bed earlier'?