Hi! I thought I recalled hearing the term. I have been preparing my journal of symptoms for the specialist (when ever my insurance gets off their #*!^$!). This "inner tremor" comes, and goes. The first time I felt it, I was lying in bed. I had just woke up and thought there was a small earth quake. It never went away. I began to suspect it was inside of me. I tested it by putting a finger between my teeth. There was a gentle, rhythmic biting action I could feel on my finger. Today I even timed it. It runs at about 3 cycles per second. Thanks for the info! David Meigs