Our lottery boat will have standard household-size beds... with nearby electricity... so we'd likely select a Sleep Number bed.
We'd been skeptical about their advertising, but we needed a new mattress at home, shopped around, sure enough it seems to work nicely. Not hot like Tempurpedic. Ours happens to be individually adjustable (i.e., each side), and that seems useful.
I found it interesting that the mattress comes in a (3' x 4' ???) box, and then gets assembled in place. Easy, and in our case it also meant not having to wrestle a big mattress up the stairs and around the corners all at the same time.
Ours also happens to be an articulating version, and our lottery boat would have that, too.