This is a GREAT question.
I work better with a deadline, I just do. It’s not discipline, I’m still working. But a deadline makes me work towards a finish line for a project, even if I may go over by a bit.
So when I do work that’s not for an editor, I make darn sure it’s a project I truly care about, so that I WANT to put pen to paper, if that makes sense.
Good question! I guess it’d be a lot harder if I hated writing, but I dearly love it.