Internal vibrations - I also have them at night when in bed. I love the tuning fork description! I'm going to use that from now on because it fits perfectly. I have Hereditary Neuropathy and Pressure Palsies (HNPP) and I just assumed it's related to that because there are sooo many issues with that. I see some people talking about rice. I don't eat rice so it's not that for me. Mine is strongest in my chest and maybe arms. My legs have so many other stronger sensations that would mask it. I think we may just feel it most in bed because we're lying still and it's quiet. I notice other issues more then too. I can feel the vibrations now sitting quietly at my computer. I asked a PCP about the vibrations years ago and anxiety was the response. It's not. I don't take any mental health meds. I stopped working two years ago and feel more relaxed now that in 40 years. When a doctor says something odd is anxiety, that's their way of saying I have no idea so the ball is back in your court. I rarely have an external tremor and when I do I feel it's related to low blood sugar. My neurologist always holds my hand when talking to me and has commented more than once that she feels a tremor even when there is nothing visual. So I think she can feel the tuning fork. It's a bit unnerving and just one more thing that makes it harder to go to sleep. I have noticed it more again in recent months or longer. I'm on various cancer meds so I'm not sure if those might impact it? Maybe other meds impact it for some of you? Meds/supplements can really impact my neuropathy. I do get afib periodically due to cancer meds, but the vibrations happen when I'm not in afib so it's not cardiac related and I had it long before afib showed up. Good luck to all with this, it's annoying to say the least, and thanks for the great description.