When I was in my early 30s I worked the night shift for about a year and a half and it was brutal! I don’t know how people can do that for many decades

My shift was Wednesday, Thursday and Friday nights from 7pm to 7am and then I had 4 days off. But I didn’t want to sleep all day on my Saturday and Sunday because I was newly married and wanted to spend time doing things with my wife on the weekends. So on Saturday morning when I got home I would stay awake all day and switch to a nighttime sleep schedule for a few days. Then on the Wednesday I would try to sleep in a bit longer if I could. But it really just ended up with me not really ever getting a proper amount of sleep every day. Truth be told I felt like a zombie that entire time I worked there. It was actually a miracle that I didn’t crash my car on my hour long morning drive back home, there were many days where I pulled into my driveway and couldn’t entirely remember my journey home!
I much prefer my semi retired life that I’m living now. I never set an alarm but I usually sleep from 11 pm to 6 am. I work part time and it’s generally from 10am until 2 to 2:30 and then I’m done. I work about 4-5 days a week. It’s a pretty sweet gig