Have you ever just rolled your neck, side to side, maybe to release tension and feel, almost hear, what seems to be "rocks" in your neck?
Like a grinding feeling but, I don't know how else to describe it... hmm, have you ever run your hands through sand, and pebbles, and have that feeling, gritty, rubbing against each other... but, in your -neck-!?
I get this, a lot.