ULD is a bad term, I say this because there have been quite a few times I was in an LD and considered it real life, yet still controlling it from the inside. So you can say I wasn't lucid, yet I still knew everything was going on and I was able to control it all.

I beleive this may be one of the highest levels of LDing because everything is so vivid that the line blurs and you slip into a second reality without even thinking its a dream. Of course most times you shrug this off and the dream fades, but there are times when you go into a LD that is so vivid that you forget about your real life and go into the reality of the LD.

Call it what you will, but there is no way you can be unaware while lucid, it is an oxymoron. You can however be aware that you are lucid with a false sense of reality.

I'd also like to point out that YOU CAN HAVE A LUCID DREAM INSIDE A NON-LUCID DREAM!!! It happens to me a crapload of times where i'll be trying to LD inside of a dream and its like doing a WILD, but much easier. You can be aware that is a lucid dream and not aware of you doing the act to go into it. In this situation its like a lead-in to a LD.

You could also have the above situation happen where you are lucid, you think its real, and you WILD while inside of a LD to an LD that you know is a dream.

I'm sorry if I sound confusing, but I wanted to hit all the different levels.