A.C.
I have a friend with a 5 yr old and a 9 yr old son. BOTH of them still wear pull ups at night. I know several other boys between ages 3 and 10 who are daytime trained, but have severe issues through the night. According to some "seasoned parents" and a few doctors I have asked, it is normal for boys to have nighttime potty issues, even into double digit ages. I'd say, as some others have, that since he is waking up, that is a good sign. He knows what he has to do, he's just not quite there yet. Give it some more time.
I'm having a hard time getting my daughter daytime trained and I'm not looking forward to the nighttime training issues.
Good luck.
A.