So this may be a longshot, but I know in Japan they have these small rooms you can rent for the night, where it's like a pod with a small tv, and other stuff. And you sleep in there. I've always wanted to sleep the night in one and see if it's something I could do. Do they have these types of hotels in Vegas?
In a number of the airports there are the Minute Suites but McCarran does not seem to have one. I know they have one in Atlanta but if you end up having to do an overnighter the best option is to shuttle to a nearby hotel.
This is actually something I think would do well in Las Vegas. They unfortunately do not have any that I know of. I mean unless you plan on staying at a camp zone outside of the city itself, you are almost certainly going to be paying for a full room.