Is it normal for my newborn to make noises while he's sleeping?

When my son was little, it was very clear that he would breath rapidly, and then slowed down before breathing rapidly again. The noises he made had gotten me worried so I googled and got this article: http://www.babycentre.co.uk/a1053604/your-newborns-sleep It was less worrying knowing that it's quite common but nevertheless, I was still unable to sleep properly because of it lol