My chiropractor said that our cortisol levels are the highest around 4 - 6 AM in our circadian cycles and the cortisol could be causing the vibrations. I take magnesium, 5 - HTP, Melatonin, and GABA before bed every night. And I sleep beautifully. My vibrations start after I wake up, roll over from my right side (in fetal position) and roll on my back, stretch my achy legs. It's like I'm trying to get the circulation in my legs started, and my heart begins to pump a little more causing these vibrations in my central upper and middle chest. I have venous insufficiency in lower legs. Also Raynaud's in feet/hands. 2 of my first cousins have Parkinson and M.S. My neurologist said I don't have either as I was tested twice. But we never discussed E.T. Essential Tremor. I had a bad concussion on my head in 2017. Now I have post concussive syndrome. Visional problems, needles pins in extremities. Gait and balance problems. High cholesterol & triglycerides. Borderline glucose /A1C prediabetes. I'm working so hard to eliminate sugar, gluten, all processed foods. Eating 99% clean whole foods, and working in my organic veg garden to grow healthy foods. I'm slow as a slug, and get SOB when I work more than 30 minutes clearing weeds and planting. I have zero tolerance gardening in the heat. I'm 74 years old. Hope this helps someone.