Also plenty of sleep. I know it's mentioned in many other articles about the well-rounded developer, but it is useful knowledge. it's easy to get carried away, but the older you get the more important a regular sleep schedule is.
Having other hobbies is also important. I have outdoor and non-technical hobbies I enjoy, but I've also been getting into video and photos editing. There have been many times while pursuing my other hobbies that I have had "ah ha" moments about work.
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