I had heard that the 4 to a room max was due to fire code. Therefore, because I am a tad neurotic, I never cheat. My kids have no problem sleeping on the floor, but I'm always afraid there will be a fire and since it is 4 max the firemen will stop rescuing us after 4. I know. My friends all say that's ridiculous, but....well, you can't pick your neuroses, right?