I’m a “morning person.” My wife is definitely not.
For me, I enjoy getting up at 5 (actually, it takes a while to get to the “enjoy” part). I walk a couple of miles, take a shower, and often fix a number of issues before 8.
One of the most productive developers I ever knew (a former employee) was a “non-morning person.” He would amble into the office at noon. Drove HR crazy, but all attempts to get him to come in earlier, met with failure. He would often stay in past 2AM.
As his manager, I got flak for his schedule, but I put my own job in jeopardy, and did not enforce corporate policy on him. We worked together for almost 27 years. Japan loved him (so my job wasn’t actually in jeopardy). His schedule worked for them.
We tend to have a habit of projecting what works for us, onto others.