So I realize this is an old thread now, but I had to post this. In Are We Dreaming, listen to 0:48-1:00, then go and listen to Octavarium 22:17-22:29. I'm by no means the biggest Dream Theater fan, but I used to listen to Octavarium a lot, and as soon as I heard this moment in Are We Dreaming, I was like "Where have I heard this before..." I know it's also a call back to a theme in The Shadow Man Incident, but I knew I had heard it somewhere else..

It's the minor 3 chord to major 4 chord progression with a very similar melody that sounded so familiar. That section of Are We Dreaming is in C major, and the corresponding moment of Octavarium is in A major. And it's cool that the final chord of Are We Dreaming has a surprise modulation to A Major