I'm not inclined to think of the mind as some other "entity". Your mind is you yourself. Having said that I often feel sleepy in the dreams where I find something suspicious... doing a reality check feels like so much of an effort that I simply don't do it, or at least not properly. If I were less of a lazy type (or more enthusiastic about RCs) then I could have become lucid on several occasions. And that's what I'd call the mind resisting RCs.

I'd also share my belief that we often know that we're dreaming but don't realize it -in the same way that you can see something yet not notice it. More than once in my dreams when I was trying to think of a way to get myself out of some mess I thought of "going lucid" as a solution. Then *poof*, lucid I was. What's more is that it felt like I turned lucid intentionally; like I shifted a mental gear. And there was also this dream where I was also in trouble and I stopped time ("Since, being in a dream I can do that.") without becoming lucid. Hence I'm not surprised at all that people who master MILD can get LDs every night.