I experience tremors during sleep which feel like a purring or vibrating sensation. They don't hurt and, honestly feel like my Tempurpedic massage feature had turned itself on! Have had complete cardiac workup including Holter monitor which showed I have no heart issues. Finally, saw a neurologist who shrugged and gave me pills (clonazepam) to hide the symptoms. All he would say is it's probably familial. Have asked every doctor and nurse I come into contact with about these symptoms and no one has ever heard of anything like this. I don't like not knowing what the heck this is! I do have a son with myoclonus sleep disorder and a daughter with MS. I have stopped taking the pills and wonder if I need to seek a second more involved neurologist. Has anyone else had these symptoms? Surely, I can't be the only person in the world!