I just had a dream where i dreamt I was dreaming. I wouldn't really call this becoming lucid because I was still dreaming and when i 'woke up' in the dream I went about talking with the other people who had been in the dream trying to find out if they had shared the same dream(turned out they did).

I also had no control over the dream nor did I wake up. I also didnt feel that what I was seeing was strange(I was riding a giant spider). It didnt really feel like the single lucid experience I had where I had a my mental voice tell me that I am dreaming and then I woke up.

Does this type of dream have any significance for beginners in lucid dreaming? Also, how common is it?