If we were dreaming, our consciousness or ourselves were trapped within dream realm. At that case, if we consider dream realm is illusion or less real than our waking life, then we can say that ourselves is less real. If we can live with that then we found thing that is less real which it’s ourselves.
On the opposite, if we consider that our consciousness were real while we were inside dream realm, then dream realm was real. Why? Because there is no way for real thing could be trapped within illusion unless we consider this illusion was capable functioning as the real one.
So, in a short, in any way we can think of it, there is immaterial thing which is dream realm. Or we can say there is more than this real waking life. Or we can say there is another reality as another dimension as real as our waking life, in the sense that we could be influenced, we could be trapped, we could interact within it … and so forth.
The problem in this case is that, on dream realm, visualization or interactions are unstable, or we might say, it’s easily changing to different life forms. But that doesn’t have to be considered as less real or not real than our waking life. We better say that there is another realm with different laws of “physics” that typically on its own realm which to be considered easily to be changed, rather than saying it’s not real and that’s not real. I prefer to say that there is no less real in the universe, but there is only degree of reality depending upon our perception.
Is there immaterial realm? Yes, there is!