I have a conflict with concentration, and doing, and agreement to invest in the moment's exertions. So I have tried to make my life more of a thing that I willingly participate in. I know this is a luxury item, in its self. However, I am having some luck stalking that tendency of mine, since I am allegedly doing what I want to do for a living at this point in time. I am paying close attention to this, and trying to suss out, just what part of me it is that disrupts my ongoing plans, and efforts.
I have found that playing music really soothes this in me, and quiets internal dialogue that ranges all over the place once I get on task. This allows me better focus, because this tendency must be assuaged some how, at least for now. I still haven't fully identified what or which child part of me this is.
Typically a disruptor would have to be from one's past as a two or three year old. Bright kids develop hard wired things at ages as early as these, and it takes some talking and courting and big time somatic memory search to find out why the kid in you might have developed a habit like this.
It resembles lack of focus or inattention, but I think it might be a defensive posture say, an inattentive state that is an environmental filter. It might be, that you as an adult might resemble a powerful parent, that the child in you disliked, or feared. That adult state of silence and concentration, and internal dialogue might happen in a "virtual room" which contains a child that you used to be, who never integrated with the adult you have become. That child often is the key to everything, if the integration can compassionately happen. Then you get the full backing of all your parts, as you collect them one by one.
Anytime regular activity grinds to a halt, and it is not hunger, or exhaustion, or real adult concerns; it is time to take an inner poll to see who is in the "virtual room" with you, and what their unmet needs might be. Always bring candy for the child in you, and that "candy" is a willingness to sink back in a chair and let your self range across all seemingly latent emotion, and find an absolute joy, and acceptance of self, all parts of self, and see what your self has to offer by way of explanation.