[jeargefef]

It's very confusing (and scary, if you don't know what it is). From my own experience, It happened right before a bunch of stuff happened in my life that changed it 'inexorably' (how dramatic), and reading Robert's account in AD, it happened to him before a big change in his life too. Not knowing really what it's about (not really buying others' interpretation of the reason for it) the only thing I can say is that the two instances happened before big changes.
Don't know if it makes sense, just from my own experiences.