I have switched my hours around multiple times. Through high school, I was, of necessity, a morning person. In college, I became a night owl, often seeing the s

I have switched my hours around multiple times. Through high school, I was, of necessity, a morning person. In college, I became a night owl, often seeing the sunrise after all-nighters. A few years of working, I was a morning person again, getting up at 4am to go swimming before work. In grad school, particularly in the crunch to finish my dissertation, I was typically working from 11pm to 8am, and sleeping during the day. I'm old now, and can't seem to get away from waking up at 6am, and there I'm stuck. But when I was young, flipping around hours was not a big deal. From my current perspective, you can't just try to change your sleep schedule, you have to tweak everything else in support. When do you consume caffeine? When do you exercise? What do you eat and when? When do you stop looking at glowing screens? What kind of lighting do you have in your environment, and when? You may need to experiment with all these variables to find what allows you to shift your sleep schedule.