Your daytime practice of RC will start happening in your non lucids just by force of habit. When you use awareness while RCing during day (practicing), you will also gain some awareness in your non-lucid at the same time when you get an urge to RC.

By then you will most likely know you are dreaming, but some RC anyway by force of habit or by decision and this confirmation puts you "over the hump" and then you will know for sure you are dreaming.

Happy dreams