Yes! I have told three neurologists about this condition and not one of them had heard of it before. They knew about internal tremors which occur in the daytime, but they knew nothing about the type of internal body vibrations which happen when asleep/waking up/falling asleep exclusively. One of the neurologists said that this can be an early sign of Parkinson's disease, but that there are additional cause of internal tremors as well. If anyone here gets a firm diagnosis of the cause, please let us all know. Thank you. In the meantime, I have been watching out for diagnoses for this condition on two private facebook groups called Internal Tremors and Sleep Tremors/Internal Vibrations. One way, the scientific community will finally know what this medical condition is, I hope.