How do you sleep?

Until I turned eighteen, I've been waking up every day before 07:00 for school without fail. (had me a crisp 98.5% attendance :3). I could still be asked to show up, even when it meant enduring hours of cruel and unusual calculus.

Now that I'm in the first year of Uni - studying a subject I find fascinating, at a pace I find reasonable - I don't even have the ability to wake up for my 9AM lectures.

I really want to make this work. Does anyone have any advice on how I can get my shit together before I end up squandering this valuable opportunity?

Sincerely, a very tired boy.