[hnthrowaway0328]

Talking about distraction, this is off topic, but I found Carmack's method very useful.

He used to go to a random motel, book for a few days, away from office, and work on a hard topic (usually graphics) non stop.

I took a poor man's option instead. Go to a chain coffee shop where you can buy a cup of coffee and sit in a corner undisturbed (human noises do not concern me). Bring a dumb phone just in case, turn off WiFi, and you are good to go.

I tried this a few weeks ago and went over one and a half chapters of "Crafting Interpreters" in 3 hours. I had to admit it was tough to go beyond that, but you might be able to do more with a healthier body. It was also from 10AM to 1PM so hunger had an impact as well.