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Looks like you're not working for 12 hours. Maybe 3-5h actual work and 5-7h of surfing, switching, returning to a context.

It happens because a nature of current state of an internet. You can try to limit your working time to a few slices of 4-6 working hours. Also try to replace short and vivid content like any news, videos to the weekly newsletter, books, tv series and so on.

I used to have the same issue and it's solved now by removing news, youtube, all social networks, junk spammy content with ads from my life.