I may not write every day, I still have to earn a living and it seems unlikely I will do that from writing even if I eventually get published, but I think about writing every day. Sometimes I think about the novels I am writing; sometimes I write about some event that's affected me; sometimes I get ideas for what I would like to write; sometimes I think about the mechanics of writing; and sometimes - when I want to get depressed - I read about trying to get published.
(I still like pbooks and would very much like to get traditionally published - that seems almost like a dirty secret on this forum, hence the small font. 
)
One of the things that I wrote to myself when thinking about the mechanics of writing was that it was a self-fulfilling thing: that to write was to always write, but to not-write was to never write. It may just be my nature, but it seemed to me that if I put my writing up on the shelf for too long that it would stay up on the shelf and nothing more would happen. It's become a compulsion for me now, and while I now sleep a whole lot less than I used to, it's the way I feed my compulsion.