When I had my first lucid dream, as I was coming out of it, i.e. waking up, I felt the vibrations all over my body. Having spoken in the dream after I'd realised I was in the dream, unfortunately the words came out of my physical mouth (i.e. I spoke out loud) and thereby woke myself, and, to her annoyance, my wife, up; consequently the dream was only lucid for a very short time. So because of the very short period between becoming lucid and waking up, maybe the vibrations occurred because I'd become lucid. However, I haven't had these vibrations when having any other lucid dreams. Also, there were differences between that LD and my others, viz. that it was the only LD in which I dreamt I was in a real place, i.e. my study (my other LDs have been in imaginary places) and there were electrical phenomena in that particular LD. So I'm wondering whether the vibrations have something to do with the relationship between the dream body and electricity or whether my experience was verging on an OOBE. Certainly the vibrations are sometimes associated with OOBEs, e.g. you deliberately bring them on when using the spot of light technique in astral projection.