Another observation is, boredom (at least for me) is a necessary pre-requisite for thinking deeply about things. I've noticed this years ago when I was at Google. When a hard problem would arise (which was nearly every day), I'd go for a long walk outside, leaving my phone on my desk. By the end of the walk, I'd usually either have a solution, or a viable start of a solution. A lot of good work was done on those walks.

A few weeks ago, my power went out and my phone was nearly dead, so I let it sit for the time. In the time I had se thing id been working on "click" while just pacing around the apartment.