Short version: Tired, in need of food. Not so much rest, as "light" weights.
This may be just me, but most everyone in our gym feels the same way.
On the other hand, when I was at Natl's, I shared an elevator with some women who were competing Masters lifters. These women had been at an International competition, in Sweden I believe, just the weekend prior to Natl's. They competed and won their flights in Orlando!?!
I have no idea how they did this. Flying to and from Europe, competing and then doing it again a week later - amazing.
All I'd say is, a meet can be a long day, well outside of anything you'll do in a gym on a daily basis. You'll have pushed yourself further than you ever have. Your food and drink regimen will be compromised, as will your sleep. Expect the aftermath to be "interesting"...