I've been on that shift for about, oh, 26 years now. I'd have to count the rings under my eyes to be sure...
Most of the important points have been mentioned above.
Here's 2 more..
Make sure you have enough gear with you. It gets cold after the sun goes down.
Make sure you have good eye protection and keep it clean. You will be amazed at how many bugs there are and also how many asshats won't dim their lights....
