I started having that internal vibrations periodically a few years ago seemed like the first time was after I was on a plane and the first night in bed after a long plane trip I would have it like the bed of internal vibrations and I somehow feel it's coming from the back of my head
I have not ever told the doctor about this, but it seemed to me like you had something to do with my vestibular system plane and the plane is shaking, sometimes get them without having been in any situation where my head was shaking and surprising that other people have had this I assume no one had this so good to know