A tingling feeling similar to my experience of AMSR (based on the whispering Youtube videos) happens when I inhale sharply and focus on the back of my head. Doi

A tingling feeling similar to my experience of AMSR (based on the whispering Youtube videos) happens when I inhale sharply and focus on the back of my head. Doing so also tilts my head back everso slightly. If I concentrate more, I need not inhale sharply, just normal breathing will do. The tingling happens always at the in-breath. A strong tingle persists over the out breath too. If I keep (over) doing it, it vanishes for some time. All this led me to believe it is muscle related somehow, and the vanishing effect is because of muscle fatigue. What muscle/muscles - no clue, something on the scalp I guess. I don't know of it's the same, but for me it feels like that.