For me, I suspect a good fraction of my night owl habit stems from my focus being easily broken by noise & general hubbub.
This was even more evident working at home during the pandemic, when Tigger’s quest for attention became hugely annoying.
Once the focus is broken, it takes ages for me to get back into the zone. Hence working late into the evenings & night, after most have gone home & the din has subsided, has always been when I’m at my calmest & most productive.
It’s who I am 🤷♂️🦉