I understand what you mean. The other night I had a very vivid dream where I was at work. I work in a pizza shop. In the dream I did not here the oven, which in reality is about the only thing you can hear in there. Nor did I feel the warmth. Normaly it is very warm. And to top it off, in the dream when I went in the cooler, there was no product anywhere. Just an empty dark room where, yet again, I didn't notice temperture. These were all clues I was dreaming, but aparently not enough to get me lucid.