A bit ago, I did accidentally create a dc, then he'd show up in my dreams, I stopped focusing on him, and stopped seeing him pop up in my LDs; personally, I was just so embarrassed about it, and surprised how he'd just show up, like a recording though and a bit "flat". And my other DC's would point him out. o.O

In regards to conversing with oneself, a copy of oneself, or representation of an aspect(or whole) subconscious self, yeah, I didn't have to create it though(as an adult per se), and like TranquilityTrip, responses can be variable from mundane to profound depending on the function/role of the DC-doppleganger-(?).