I've noticed that about my dreams.
The other day I went to a party and had a great time. When leaving, I had one thought about parallel parking, but I didn't really pay attention to it and went on thinking about something else. That night I dreamt not about the party, but about the thing I thought about least: Parallel parking.
So yeah it makes sense that if you try to avoid thinking about something that it would be processed mostly by the SC, which is what drives the dream. Pretty cool.
"What if I said to you, 'don't think about elephants?' Now what are you thinking about?"
"...Elephants."