Recently, I read several good articles from World Economic Forum about
distraction, nap, and productivity.
Distraction
Sometimes when I needed a break, I went to Slack, email, or social networks, only to find out that I was simply context switching to another task: more work, less focus, no relax.
So now I forced myself to simply take a walk, look out the window, or causal chat with people; anything that will NOT fork another work thread.
Napping
I took naps all the time, and I plan to keep on doing it.
Productivity
Planning is important, but sometimes I found it much simpler to just pick something and do it to avoid over-thinking.
When I feel over-whelmed or hard to decide, it is usually a sign that all the tasks at hand are similarly important.