Question about DILD's

Probably a simple yet complex question...

but, when you "realize" you're dreaming in the middle of a dream plot, like noticing that nothing here makes sense, what actually goes on in your brain?

From what I know, the logic center is turned on. But surely something causes this to turn on right? It seems weird that all of a sudden we can realize we're dreaming when the nature of most dreams is to make up a reason why all of this makes sense, to prevent the logic center from turning on.

I mean, isn't questioning reality in your dreams itself already using logic?
"this doesn't make sense, therefore i should reality check." <--- logic.

or is it just a habit that carries over to your dreams? but even if that's the case, i'm still stumped on how that would trigger the logic area of your brain to turn on, because sometimes dreaming about lucidity won't make you lucid either.

questioning is still a trait of humans even though we may not be using our wakeful logic.

DILD is my specialty, there will be those who know more than I do, but it's the only thing I can do, so I know a lot about it. I more describe it as when you see something weird, when you question it, a tiny bit of logic turns on, but most of the time you just let it slide and ignore it. When you don't ignore it, it turns on enough for you to realize that you're in a dream, but it can turn on more than that too, remember that. Even when you know you're dreaming it doesn't mean your brain is fully turned on and conscious. Even when you realize it, for the first couple dozen DILD's you will still act kind of weird and impulsive, and won't be able to remember much from real life. As you get better, it'll be more turned on and you'll act less dream-headed. When you wake up from your first lucid dreams, you'll think that you did act a bit weird at first.