By chatter, do you mean grind? All birds will beak grind when they are sleepy and content, or sometimes just one or the other. Also, Sugar's beak is peeling and it looks awful, but she won't let me get near it with a file, lol. So, it looks bad. But her diet is good, she's got plenty to chew on and the Vet said not to worry too much.
Without a pic though, it's kind of hard to tell if what you're describing is normal.