.... I am a little concerned about starting my car at 6am after being in potentially zero degree weather or lower for 8+ hours. Isn't starting your car at the coldest time of the day the worst thing you can do as far as temperature related car things?
Well it sure ain't the best. Starting a stone-cold engine at the coldest time of day, oil thick, battery handicapped by cold. And look at your daily driving cycle in your case - Headlights ON to work, short trip, not much battery recharge. Then sits and gets cold as a stone. 6 AM, probably still dark, start car, turn on dome light so you can see the frost to scrape off, while it tries to re-freeze about as quick as you scrape. Takes quite a bit of idling to generate any engine heat in northern winter conditions from cold start. Then you probably will have headlights ON for the way home, short trip again, limited battery recharge for what you took out of it. Watch that battery charge. If you have a garage, can run a charger on it when needed. If you're living in an apartment building, I knew one guy who had a spare battery he would charge in his apartment, and learned how to change a battery pretty fast if needed.
Be "glad" you live in the era of fuel injection, cars start and run a lot better in the cold than back in the carburetor days, that's for sure!
I never worked graveyard shift, but in my early college years, worked factory second shift, 4 PM to midnight. Then up 3 days a week to make it to a 8 AM class, 9 AM the other two days. About a half-hour drive to school. Come home, eat some quick lunch heated up out of a can, do homework, go to work. No time for social life.
Weekends, I tried to get out like normal people, but work and school always hanging over me.
One summer, I didn't have any classes. Free time! Joy! NOT! I was off while everyone was at work. And when they were off, I was at work. During weekday mornings, only moms with little kids out and in stores. Desolation for a young man!
Been there, done that. It's a tough life that many people don't experience. I feel for ya.
Working in factories, I gathered enough $ and college credits of the right type to later transfer to the Big U, where I got an Engineering degree (any lab-type class for me was an easy A, as I was always science-oriented, and very practical). And my life changed. But can never forget those days. They are part of me.
I wish you the best! Sometimes, ya gotta do what ya gotta do.