Quiting diaper during nap!

I told him he has to quit his diaper during nap time so that when he goes to school next year, he will not need teacher to help him. So, we tried it up and it worked on the first day. He went to pass his urine before his nap. One hour later, he claimed for wee wee. I brought him to washroom. After his business, he went back to sleep for another hour. I was so amazed!

Second day, as first day, he past his urine before nap but some how he did ask for wee wee during his nap. As a result, he got wet but he still fall asleep for another hour!