DS (6) has Asperger's. We've been having a lot of problems with him wetting himself. The health visitor suggested it was due to bladder spasming, and we should measure his wee.
Well firstly, when he realised he had to pee in a pot and measure it, he thought this was great fun, so toilet training improved.
But THEN he got bored with "only" producing 50-100ml, so has taken to taking himself to the toilet, weeing in the pot, then topping it up with water! He's currently "producing" about 400ml at a time!
I've tried to explain it to him, but he's not having it, at least he's not wetting himself so much!