Wow this thread comes pretty close to what I am trying out right now. Here is a part of my workbook:

I decided I want to try being aware of my breathing at all times. That way I have an easy task, that I know I can accomplish. I have been trying this out a bit and I have noticed this also interrupts my dozing of. Every time I start mindlessly doing stuff I realize I am not aware of my breathing. And therefor stop dozing off. So it helps to keep me aware.
This also gave me a good idea. Since I now have multiple times a day, where I realize I am not paying enough attention. They are the perfect time to do a RC.

Indeed, the way you feel after snapping out of a state of non-awareness, feels a lot like waking up from a dream. So by training on catching yourself in the act, you might just do that in your dreams as well.

But, even if it does not help. You still are making yourself more aware by stopping your dozing off. So it makes your day a more aware one in general. Plus, since it feels like you have just awoken from a dream, it is very easy to question reality. Making your RC's a lot more valuable. And lastly when you have a FA, the first thing you will do is RC since you again feel like you dozed off for a bit. So it will help you in all your FA's as well.

In the end. If it doesn't help directly, it still helps indirectly. The side-affects are good enough for me, to practice this.

I have only started this training in the last 5 days. So I guess I do need more time before I can confirm all this.