So, lately, i've been getting lucid dreams in an odd sort of manner.

Usually, i'll be having a nightmare (sometimes not) and just when something bad is supposed to happen or the world is falling apart the dream will fade and i'll be "floating" in a black void, at which point I become lucid. Then, the dream scene changes to that of an actual dream and i'll be lucid right from the start.

This is good and all, but the problem is, I have no idea how I induced it. There isn't any hypnagogic imagery or any strange sounds while in the void and the LD itself is very similar to the DILD LD I had once except I tend to lose lucidity or enter a new non-lucid dream (though that is a different problem.)