So... don't do that? If it worked before, but it doesn't work in theory, it works. It might not even be placebo! Perhaps the combination of (well rested) + (op

So... don't do that? If it worked before, but it doesn't work in theory, it works. It might not even be placebo! Perhaps the combination of (well rested) + (optimistic) means you have a good day, and the experiment changes those conditions enough that you get different results. Heck, you might end up having better days more often. You never know if you don't try.