@martinies,
I once had it when both awarenesses happened on the commute into London.
I was talking to a fellow commuter, when suddenly, his conscious awareness left the train at Harrow and I had to finish the conversation by shouting, even though his physical being was right next to me.
When his conscious awareness was too far away to communicate with any more, I just turned and started a conversation with another commuter whose conscious awareness had only wandered as far as the restaurant carriage.