I have worked shift work in the past and really enjoyed it, though it can be hard on the body at times.
I know exactly what you mean.  I worked at UPS loading trucks for hours.  The place was running 24/7, even on Holidays.  Where did you work?
Wow, that would be busy! And to go 24/7 especially on the Holidays can be tough. I worked at plant called SuperHeat, worked in the office providing information to the techs calling in from around the world, around the clock.
I bet that was tough.  Do you have a lot of technical experience.  I don't, that's why I was busting my bottom to become a truck driver.