I usually devolve into reading junk novels and playing video games for a while (couple of weeks to couple of months), but then, eventually, do some work on some stuff. The latter typically happens because I get bored of being useless and get inspired to do something by talking to/with someone - I'm really bad at breaking out of that pattern on my own.

I find it's a problem of isolation (mental and physical - one or the other slows me down, but put them together and all useful production grinds to a halt). I need to spend at least some time working on pretty much anything with pretty much anyone, which puts/keeps me in a do stuff mode. The trick is having that baseline work at a low enough level that it leaves one with the time and energy, not just the inclination, to do one's own work (currently, not so much teh case for me - I can get a bit done here and there, but I'd prefer my 'real' job be, say, 3 days a week).

Alternatively, I find that just feedback can do the trick some of the time even if I'm not actually working with someone.