I was a night person for the first 35 years of life or so. I even got a job that generally had me working no earlier than noon, and as late as midnight. I loved it!
But when circumstances changed, so did I. Now it’s up at 6 AM M-F and off to work, finish circa 3:45 PM, home, and generally lights out by 11 PM. Now on weekends if I sleep until 8 AM, it seems late.
Humans are pretty adaptable, frankly.