I really can't brush my hair out at all. I used to try to before oiling overnight (when I didn't care if it got frizzy or not) but now the only time I comb it is in the shower when it's wet with conditioner on it.
The curls just tangle together (it doesn't look knotty, the curls just like to be friendly), and I've found that brushing or combing it dry is too damaging.