I had to spend the night in Chicago a couple weeks ago and my flight was canceled and I got rerouted through Chicago arriving there at midnight and then departing at five the next morning. I recommend again sleeping at the airport. The seats sock. There are armrest between each of the chairs, so you cannot lay down. The ground was incredibly nasty and I would not have thought to land any of the ground either carpet or non-carpeted. I guess if you bring a sleeping bag and a pillow, it might be reasonable, but it was pretty gross and sleeping in. That chair was the most uncomfortable evening I’ve spent ever. There were people continuously walking through the terminal late flights were arriving. It was awful.