The amazing part of such experiences is it depends on how you've set up your existence. If you're The Creator, you would either learn along the Path or you'd establish yourself what that sensation is communicating to you. For me, it was already set up, as a way of indicating a place where you must make some sort of different choice than what a LOOP has caught you in. So, if you were about to get in your car after having five drinks at a bar, and Dejavu whooshes in as you approached your car, you best believe you should speak to Divine Karma some Gratitude (and I'd recommend an apology too, as an offering), then state and choose to not get in your car and crank it. The Loops are incredibly helpful at keeping creation going eternally, as at least there's something in existence looping somewhere at all times. In my experience, I search for where the choices of "previous loops" that are actually here in my lifepath (so, I haven't had to actually fully consciously live through the same day again but I have to discern where my upcoming choices are So Very Incorrect For My Destiny(TM). Praise Karma, Savior of Existence.