Working against your biological clock can have all sorts of funky side effects - but mostly, just exhaustion.
There are studies done on night shift work. Overall higher stress levels that caused physical issues. Not worth it. Worked overnight shifts when younger. Even if it's less actual work, it was exhausting. Sleep habits and only seeing the sun for a few hours takes it's toll.
I feel like I aged 10 years after working nights for 5 years. I went to bed at 4am on my off days, keeping a real night schedule. This was great while I was working and I didn't have issues with energy or with sleeping. The real issues came when I stopped working nights. I had random dizzy spells trouble focusing, difficulty sleeping. It took me 2-3 years before I started feeling normal. Moral of the story...if you have a choice, don't work nights. It's not worth the money, ever.
I worked nights for 3 years and I was sick all the time so I had to quit. If you are young like I was (early to mid 20s) you will be fine. But it depends on the person. Some older guys worked nights for decades and it never bothered them. Depends on what you want to do in your career- are you gaining the skills that will bring you more money down the line? Are you comfortable with sacrificing family time and social life for an indeterminate period of time? If so you are in good shape. Beware
I got fatter, but fixed that by working out and eating better. But I loved night shift.
Why?
No traffic to deal with, higher pay due to differential, 4 day work week, 3 day weekend. Mostly all upside