One of my co-workers setup and office in his garage for this purpose. Even though he had an "office" of sorts in his house with his computer and all, it didn't

One of my co-workers setup and office in his garage for this purpose. Even though he had an "office" of sorts in his house with his computer and all, it didn't provide enough separation to switch his head-space, especially because he'd potentially be in there on his computer for reasons besides work. So he setup a separate office with separate equipment for work. When done, he just leaves the garage. The point being the commute might not need to be that long. Just a signal to your brain your done.