I have considered myself a night owl all my life, ever since I was a kid. I typically stayed awake until 4am or later. Weekends, always sleeping super late -- 2

I have considered myself a night owl all my life, ever since I was a kid. I typically stayed awake until 4am or later. Weekends, always sleeping super late -- 2pm, often later. Having a 10-6 job has always been hell (and 9-5 impossible), with frequent oversleeping. The last few years I have been going to bed around 1am, but still struggling to get up early. About 4 weeks ago I started limiting my caffeine intake. I only drink a bit of espresso in the morning, then nothing after that. The impact was immediate: I suddenly found myself waking up before my alarm clock, every day. In the weekends I am generally up at 8am, which for me is highly unusual. I'm weirded out by it, actually. Caffeine seems to really mess up one's circadian rhythm. (I don't think the OP is a night owl; an evening person, maybe, but going to bed by midnight is laughably normal.)