Often during my non-lucid dreams, I'll be having a conversation with a dream character, and I'll suddenly decide to bring up a particular subject that I will not elaborate on (it's deeply personal). As soon as I introduce the topic, the dream characters around me lock up and stop interacting with me. There is a distinct empty look in their eyes, like they just turned off or something. They remain this way until I do something unrelated to the new subject to get their attention, and then they will talk about my action, but they will not discuss the "problem topic" and react to it only by freezing up. Anybody experience anything similar, or perhaps know what this is all about?