Thanks all for the variety of suggestions and links. I will keep an eye on what's happening and see how it develops. It doesn't feel biological to me - it used to occur during meditation when I focussed on my third eye area but now it seems to have progressed to other times. Also, it sometimes disappears only to return instantly when I focus upon my crown again. This isn't the behaviour of a medical condition even with the much-loved placebo effect!
My meditations have been much deeper lately and my dreams have been more colourful, spiritual and vivid, so I think this is all linked. It's very exciting for me.
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