I'm a night owl; I'm wide awake and super productive all night. During the day, I'm kind of sluggish and unproductive.
It's apparently a genetic trait. I took a DNA test about a decade ago and paid to have my genetic data matched up with current research into specific genes. Turns out I have a gene associated with people who stay up most of the night. My mother and grandmother are the same; they usually don't go to bed until after 3 AM most nights. So it's definitely a genetic quirk and not necessarily a choice.
I spent 20 years in the US military, which required me to get up at ungodly early hours of the morning every work day. I was miserable for those 2 decades. Every day off, I slept in until close to noon just to feel rested again. Every work night, it was a struggle to go to bed at a reasonable time and shut my brain down so I could wake up ready for another day at work.
I have ADHD, so getting my brain to be quiet so I could sleep has always been a challenge. When I retired from the military, I fully retired. No more work for me; my pension and benefits cover my basic needs and that's good enough for me. Now I sleep when I'm tired and get up when I'm awake, no matter what time of the day it is.
I think, because of my ADHD, I prefer the nighttime because it's dark and quiet. No distractions, no noises, no people. I can just focus on what I need to get done. During the day, the world is filled with distractions and I can't focus on anything.
It's currently 6 AM here. I've been up all night long and I'm actually going to stay up as late as I can today. Every once in a while, my sleep schedule gets flipped so drastically that I end up sleeping all day and being awake all night. Which is fine, except that since COVID, most places aren't open all night anymore. Not even Walmart or McDonald's. So I can't be productive with anything outside of my house.
So I reset my sleep schedule by staying up as long as I can the next day. Eventually I'll crash and sleep most of the night through. Then I'll be awake the next day and have plenty of business hours in my day to get stuff done.
Honestly, I need days to be about 26-28 hours long. Every single day, I stay up just a little bit later because I'm not tired yet, and that's how my schedule eventually flips completely. If I could just be tired at the same time every night, I could maintain a solid schedule. I'm married, so I have to consider my wife's schedule too. She gets lonely if I'm sleeping all day.