is there a theory on why those inclinations exist? why would someone strongly prefer to wake up at 6am versus someone else at 10am - but "prefer" not as "I'd li

is there a theory on why those inclinations exist? why would someone strongly prefer to wake up at 6am versus someone else at 10am - but "prefer" not as "I'd like that better" but as "it's impossible for me to adjust to it without mental and physical harm"? as far as my observations go it's not really a hard wired neurological fact but rather a result of psychological resistance and self-reinforcing circumstances: I don't like my job -> don't want to go to bed yet (need to do sth I enjoy and also b/c I want to artificially stretch time until having to work again) -> I don't want to get out of bed (because I don't like my job and I also happen to sabotage my sleep by avoiding it at night and hence I didn't sleep enough) -> apparently I'm an owl ... one question would be ... are there owls who enjoy whatever forces them to get out of bed early?