I guess it completely comes down to the individual. For me personally, having deadlines with someone depending on what I'm delivering does help to get myself rolling with work I find boring. Of course, I've also noticed that I can do that for only a short time and if I don't get some interesting work to regain my motivation, I'll end up getting depressed.
Right now, I've structured my client work in a way that allows me to switch between things every week. That way I can do a boring thing for a week, then do something interesting, and then back to the boring. If there's no interesting paid projects, I just work on things I can find enjoyment in - learning new things, working on things I enjoy and dropping them as soon as the "fun" goes away.
For personal projects I avoid breaking them down into smaller steps. With smaller steps I can see the mountain of work ahead of me (most of which isn't that fun) and the motivation to work on it goes away, even if there's still plenty of enjoyment to be derived for said project. That's also one of the reasons why I rarely release anything personal I work on - the fact that once its out there and I would need to maintain it, kills the fun.
I also try to limit my working hours to a certain range; the only reason why to work outside of those hours is if I've been slacking off previously and need to catch up to hit a deadline or if the project is so much fun it's already as relaxing as anything else I could be doing to wind down after work.
Getting 8 hours of sleep is also very important for me. Any less for an extended period and I'm beginning to inch towards a depressed state of mind. Any more than 8 hours and my procrastination goes up.
But yeah, finding out what works for you is always difficult, and I think it also changes with time.
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