Writing dialog

Here's an overheard conversation between brothers, 4 and 5, in bed in the dark. I wish I could write dialog like this.

J: Remember when we were driving back from Papa and Grandma's after opening presents?
C: Yeah
J: You fell asleep and I saw Santa. He was going back to Papa and Grandma's house. But they don't have a chimney! And no one can unlock the chimney, not even Santa.
C: But God can unlock the chimney, cause he's special.
.
C: I wish it was gonna be day in 3 minutes.
J: Me, too.
C: I wish it was always daytime.
J: When we go to heaven, it will always be daytime.
C: And we can't even bring our house up to heaven. Not even our furniture.
J: And not even our guns. There won't be anyone to fight in heaven.
.
C: Yeah...but we can hit Daddy.
.
J: I can jump off the roof of our house.