Usually, I have vivid dreams, but last night my dream dragged on and involved a story that was borderline sci-fi and a bit horror -like. I woke up when I dreamed that that danger affected me personally, and I was relieved it was only a dream. I was therefore already awake, but in my first seconds of consciousness, laying on my back, when - for the very first time in my life, I felt a gentle but very clear vibration in my upper torso and my upper arms. I observed it for some seconds semi-alarmed, semi-curious... I even began to wonder if maybe there was a distant earthquake that my body was picking up. I then forced myself to stretch, and that helped to stop the shaking. Immediately afterwards, I turned to Google to search for this unusual symptom, which led me to this page.... Apologies for my English, I am not a native speaker...