You know, Kriston, I've heard said before that any number of factors can go into a low score, but only one factor goes into a high score: what you can actually do. Sleep, illness, general discomfort, etc. can all skew results low. But you can't test better than you are -- if you got it right, you got it right. So without knowing him or any specifics, I'd guess that his WJ is probably more accurate than his SB. But you already know that.
So that said, good luck with the testing! Before Benjy's testing session, I set the clocks an hour ahead so he'd think he was going to bed "on time" at 8 -- read, not sleeping until 10. He went to sleep by 8:30 and was completely well rested the next day! Just an idea for sleeping from the mean mama.
