I sometimes get this strange sensation that starts on only one side of my head - left - and I can sense it on the left side of my body, also, all the way down to my groin/testicles. I find it hard to describe the sensation. It is almost like a head rush - or a chill or tingle - in my brain; and it is accompanied by memories that usually take a more linguistic form: I remember words being said or written, plus a little about the context. However, within what seems like milliseconds, it dissipates and I cannot remember what the words/memories were. The sensation doesn't happen often, but when it does, there is usually a cluster of them over a few-hour period. It happened this morning, and the only thing I can link to it was having some unual and very vivid dreams overnight. I awoke feeling a little confused. Any thoughts?