I was standing on the platform of the train station, waiting for my train, and it was only after I had boarded that I realised that I had been largely absent. There was attention spent standing, and watching the people coming off the train, but this was largely an automated activity. I had fallen into a pattern of behaviour.
It was only after I had sat down in a seat that I was feeling fully aware again. It seems to me that this falling into automated behaviours happens almost by itself, that full awareness comes up and then falls away again as we do little bits of automated activity.
I had not previously noticed it for such short periods. I’m going to try to keep track of what other activities cause my focus to wander, it might be interesting.