Or whether or not it is meaningful, it is certainly fraught with all the associated confusion of personal identity, the arrow of time and information. I don't think anyone can claim to understand it well enough to assert that those of us who see the Sleeping Beauty problem entailing a different payoff scheme are obviously and demonstrably wrong. We know how to answer related decision problems but no one here has established the right or the best way to assign the payoff scheme to credence. And people seem too frustrated by the fact that anyone could disagree with them to actually consider the pros and cons of using other payoff schemes.