I'm pretty similar - by far my most productive days are when I successfully ignore the world for hours on end. And it really doesn't matter what I'm doing, tho

I'm pretty similar - by far my most productive days are when I successfully ignore the world for hours on end. And it really doesn't matter what I'm doing, though creative work benefits the most. When this doesn't work, it usually means I'm spinning my wheels on something and not getting anywhere. On those days I tend to set up an hourly "write down what you're doing" reminder - it's just enough of a reminder that I notice the lack of progress and switch to something else, without losing any kind of groove if things are going well. But personally, I go to a coffee shop and get a ridiculous amount of work done, because I know I can ignore everything that happens around me. At work people ask me questions, or at home the cats celebrate my presence by knocking stuff over and then throwing up on it - anywhere else, and the only channels to reach me are async (chat/email) or high enough priority that they're worth never ignoring (phone, pagerduty, etc).