I followed the suggestions from MAP and introduced energy raising to my going-to-sleep-routine. For the past couple of nights, I felt a definite throbbing sensation on the center point of my upper lip, faster than my heart beat, which lasts for, say, 15 minutes after I stop energy raising. Also, I don't experience this during my daily energy raising. It is mildly annoying, not really worrying about it, but I'm just curious: what is going on here?