I do not think it is that different for everybody – it seems that different people are tying to describe similar experience. After all, it does have physical basis.

The problem is – it is almost impossible to describe.

From my experience: heady, airy, calm yet intensive and very focusing. Intensity of some sensations increases dramatically while others diminish to insignificance. For example I can take more pain (and it sensation changes) but too much pain will snap me out of it.

As to that article – I do not know if it is true that females go ‘under; (or ‘over’ or ‘up’) much deeper and more fully than males … but my self awareness rarely drops to zero. Certainly not to a point where I would ‘happily allow my throat cut’.

In fact I would venture to say that my self awareness increases but self changes. If it makes any sense.
That's interesting! Even though I've never experienced sub space, I've been in a similar state a few times before while being hypnotised. Could it be that it's just another trance phenomenon? The characteristics are much the same: change of focus, heightened awareness (although that's usually only on very select feelings, body parts, thoughts etc), different reaction to pain...the list is endless. It would also explain why it's so hard to describe once you come off it, why regular rhythm (as in flogging) does seem to induce it, that the experience is different for most people. Well, basically the whole list comes to mind, lol.

If it IS a trance phenomenon, it makes me wonder whether it can be voluntarily induced through hypnosis.....veeeeery cool thought!! Any hypnotists among you?