I have these every so often. But I believe they are related to the Small Fiber Sensory Neuropathy that I received as a gift with the advent of Sjogren's Syndrome. When I really push myself they happen and I notice them most at night. Have any of you tried taking Vit. B12 in the Methocobalomin ( hope I spelled that right) form, 1000 mg. a day. It may help the vibrating. I started it today after a lot of research.