For me the real struggle is that I'm so conditioned to getting up early now that even if I don't get in til 4AM, I'm going to wake up at 8:30 at the latest and not be able to go back to sleep.
Other problem is that more and more it seems like booze sneaks up on me. I'm on my 7th or 8th beer wondering how I can be such a beast because I barely feel buzzed at all and then one beer later I'm hammered.
I peaked at 16. Back then I would drink a 5th of cheap whiskey to myself and then pound beers for hours afterwards. I'd blackout but everyone told me I was putting them back like nothing late into the night and never getting sick.