Hello,
Yes, I can second that. She works non-stop and picks up speed at night, just after the dinner. If I sit quietly with straight back, I can feel sensations everywhere in the body.
Pricking, needles and electric jolts are a sign that you are pushing it too much. I did ignore this sign (no one was there to keep an eye on me) and found that it quickly becomes painful.
It will , as in my case, hopefully go deeper in the body and become finer for you. You might want to reduce the practice or stop for some days, just to see how the unpleasant sensations behave.