Hi Pooky. Found this interesting tactic in dealing with this from another forum.
You could try keeping a note pad with you when you're trying to concentrate. When you think of something unrelated, jot it down quickly and tell yourself, "great idea, brain! we'll think on this later." and then get back to what you ought to be doing.
I find that it's helped me immensely. I get ideas for random projects, interesting word combinations, or even just things I need to deal with later that pop into my head when I'm trying to work on something else.
Writing them down helps me keep those thoughts "safe" so that I can think on them later and don't have to try to keep them in my brain while I'm trying to concentrate on something else.
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