This sort of thing has never worked for me. It's like the snooze button on an alarm clock; instead of hitting this relatively large button, even my half-asleep brain will precisely locate the off switch every single time.

I've found greater success in just observing my impulses. While I'm working, I might get a desire to type the "hn" keyword into my URL bar (guess where it goes). But because I've noticed this before it happened, I can choose to not do it. If I find myself "idling" on such distractions without realizing, then that means it's time to do something else. Get back to work. Take a break and relax. Get off the screen entirely. Anything else, just don't idle. This seems to get easier with practice.