I typically go to bed around 1:30am, and wake up around 9. But in two weeks I have a marathon with a 7am start - and a 4am wake up to catch the bus. I know from painful experience that I do not do well without enough sleep.
Over the next 13 nights, what's the best way to move my sleep pattern "forward" by a few hours? Gradually? Or just set my alarm for 4am tomorrow and every day until my body adjusts?