If they are your regular friends then that usually means that you are just glad to have them around and that you have built enough trust and hang out with them so much that wherever you are, even in your dreams, your friends are always there for you.
If its a dream in which you and a friend are more than just friends then that can go two ways. One you might see them a little more than just being friends or have considered it, or it was just a once in a dream kind of thing. Truthfully, I think its more the first one because in your dreams your mind is telling you who you have once considered or at least found somewhat luring.
Hope this has helped! :)