This has only happened the once but was the most amazing thing I have ever felt.
It had been a week since I did Reiki 1 so that must have had something to do with it.
I am not sure exactly the details that led up to it because it was so long ago but not too far into a meditation sitting on the sofa I could no longer feel my body at all, unlike any trance state I have ever been in.
All I was, was a pulsating body of energy. And my energy body had a centre, the pulsating was originating from my navel area, known in Reiki (as you all know) as The Dantien. It was like a core that the energy was originating from (?)
I wish I had described it then, because you forget the feelings I do remember though that it was True Bliss!!