Since October last year Monkseaton High School, in North Tyneside has delayed the start of lessons from 9am to 10am.
It was part of a test to see if teenagers are actually "more awake" in the afternoon, as suggested by Oxford University neuroscientist Professor Russell Foster.
Headteacher Paul Kelley says preliminary results show that since getting a lie-in there has been a 27 percent decrease in long-term absence.
He added that there had also been a "significant" increase in GCSE results… and that the teachers looked more refreshed too.
Professor Foster found that teenagers performance varies depending on the time by performing a series of memory tests. He claims people's body clock shifts during teenage years meaning they are programmed to wake up later and are not lazy.