As an aside, I also write constantly. I have an app on my phone, so that I can fill any downtime I have with writing. This has been crucial for slow jobs, where my brain tends to wander and I end up thinking deeply about subject material. 

Currently, I'm between jobs (honorable discharge from Air Force), so I have to adjust some of my habits to accommodate a greater amount of free time. Ironically, this shift has made me less productive, much in the same way that one might collapse in their home after a long journey. I have to tend to my own needs.