Using logic in dreams, if you had not used it before, is indeed a good sign. This usually starts happening, when your daytime training starts to manifest itself in your dreams.

I can only guess, that you have been doing maybe some RCs with questioning your reality. I would advise to add more daytime awareness training to your current training, so you can get over the hump and get lucid.

SAT - sporadic daytime awareness
Collection of techniques for DILD