I've had in the past dreams where one of my DCs knew it was a dream but I did not or one of my DCs pointing out that chances are high it was a dream. In one such dream in the past I then proceeded to try to educate my DC about lucid dreaming while I was not lucid, pretty ironic in hindsight. I have also had a debate of who the dreamer is: me or the DC with the DC stubbornly insisting that he was, and in that dream I was lucid but could not win that argument.