I think so too. I get it a fair bit of what you describe and it is a rather strange feeling, isn't it? My (totally unscientific(!)) take on it is that my subconscious brain recognizes overload before my conscious brain does and hits some kind of "shutdown" tripwire. I'm there, but not there. It lets me deal in the timeframe, so I can't really complain about that, but wouldn't want to spend all my time there, you know?

Sending good thoughts your way.