I am the same, and also weight lift and ride bikes so it's not from lack of exercise either.

My sleep cycle drifts naturally forward, and it has lead to many weird issues. I don't fit in a 9-5, at least not without feeling like shit for 80% of the day, being basically useless during the 9-5 portion.

I'm happiest when I just let it happen, and accept that for some portion of the time I am essentially a night-shift worker. But I'm not totally satisfied with that, either. I would love to be up at 9am and down at 1am every day, I think that's the sweet spot. But inevitably 1am becomes 2am, 3am, 4am, 5am, and at about 7am I will just stay up for 24 hours and start all over. This happens over the course of a month or so.