Yeah, no true flawless RC. Your mind is capable of a lot. That's why it's good to have a kit.

-Nose Pinch
-Look at hands
-Some form of gravity RC (how your body feels)
-WakingNomad suggested you try and use magic as an RC. I personally think it would be good if you were confident, probably not bother.)
-Things that behave oddly in Dreams (mirrors and such)
-I just thought of a Shadow RC. Do you have a shadow in dreams?