Sorry to derail the interesting discussion, but getting back to the OP:
For those of you who work in the electronics field. Who leave a bench at work, then get home to your own bench, and stare at the wall because your brain is mush.. How do you keep the personal project work flow moving without going nuts?
I face the same problem, but probably under slightly varying circumstances. Due to a long period of being ill I am glad to get out the door again to something (be it work), but at the same time the work I have chosen is a hard compromise between ease of access (company culture / travel / flexible possibilities) in trade of level of work (which is uncertain how that will develop, very likely for the worse).
I think it's hard to force yourself to "keep" a flow. I've got projects that I've started last summer and still need firmware to be completed. I'm not worried at all, I am glad at the point where they are at and what I got back from it as an experience.
In some way my hobby projects differ from work in that in hobby I want try new stuff and see what it does/works, but at work I just want to make stuff that works, and with the least amount of trouble/effort please.
Like others said, it's good to know when to stop instead of pushing yourself. I've practically enforced myself to close all CAD and IDE's at the clock of 9PM (if not earlier). If I don't it's very likely it will affect sleep or a clean state of mind, so instead I will spend the 3 hours browsing the internet, playing games, watching series/movies, or reviewing music for my ever expanding collection.
In contrast when I still went to college I had a relatively long commute which I only now realize didn't do that bad. I had a 1,5 hour commute to my college and 1,5 hours back. That sounds like an awful lot of time wasted each day (3 hours); however I "kept up" with short nights (6 hours) which I sort-of extended on the commute to college. On the way back however I have never grabbed homework or the laptop to keep on working; instead I've spent the time losing focus for some time. I think it worked like a "brain powernap" as I was very often able to do something for my own hobby in the evenings.
It could also be that I enjoyed college more than I do work now, and at college I was already heavily involved in my own projects more than anything else. At the moment I also have a 15 minute commute time, which is way to short to lose focus.
I notice that an easy walk for an hour (which happens to speed up my revalidation process) helps a lot as well.