Is it watching your eyes? Or sensing steering wheel inputs or something?

I turned mine off, too.

 

It says it watches the eyes somewhere, but I was wearing sunglasses, so I'm not sure how that works. It was aggravating on the long road trip.

I also find that the 'brake' warning is overly sensitive. The car turning in front could already be out of the street and it'll come on and even slam on the brakes.