I would best describe my sleeping schedule as having slowly gotten worse and worse over the past decade.
Back when I started college in 2010, I had for many years previously always been obsessed with being in bed by no later than midnight. (There was one incident in my first year when noisy neighbors got especially disruptive and I complained about getting only four hours of sleep that night.) But once I began my second (and final) year of college, the increased work essentially made it impossible for me to do that anymore, and it suddenly became common for me to get less than four hours of sleep on the weekdays.
After graduation in 2012, I was pretty much unable to go back to my old habit of being in bed by midnight, and as I took on new hobbies in the years since then, it has just gotten worse. In 2013, I often considered 2:00am to be the absolute latest I wanted to be in bed by; in 2014, that became 3:00am; in 2015, that became 4:00am; in 2016, that became 5:00am; in 2017, that became 5:30am. This year, it's been a lot more scattered, sometimes I was able to go to bed as early at 4:00am, and other times as late as 6:30am. As for when I wake up, I have my alarm set for 9:00am or 11:00am (depending on what I want to get done that day), though I frequently just shut it off and end up falling right back to sleep for another hour or two.
Needless to say, I've long since reached a point where I just feel miserable about how late I've been staying up every single day. For the last couple of years, my goal has been to consistently go to bed early enough that it's still completely dark outside (in the summer months, that can be as early as 3:30am), and that's still my goal, though the fact that I've been working on that for so long already shows just how much I've been struggling. In fact, I had really been hoping that this would be the year that I could finally break that worsening pattern (among other things, I want to play my Lego video games only during daylight hours, so an earlier bedtime would mean I could make more progress on them each day), but so far even my best self-imposed reasons for going to bed earlier just haven't been very effective over the long term. I just don't know what else I could possibly try at this point...