LAS is actually the only airport I've ever slept at. I took a VDB out of there once in the middle of Spring Break and on a fight night so there were no hotels to be had. It wasn't terrible, I found a bench of seats without armrests, put a shirt under my head, an arm over my eyes and slept a few hours. I'd do it again if I was in your circumstances, it's not awful or "for the homeless" as mlassoff said.