Having inactive side projects (as in never started, or a tiny bit ages ago) interferes at least 'emotionally' for me. Sometimes I can't stop thinking about an idea I want to work on, excited to 'go home' (i.e. stop working) and work on it, but then by the end of the day I'm too tired, if not physically then of sitting or computers, and cook, eat, and sleep instead.

For a while indoor 'cycling home' as I did when I went into an office more worked well to delineate the day, shower, and get on with something of my own feeling refreshed. I still do it, but I suppose I'm used to the feeling or whatever, I don't really find the same benefit any more.