If you have to find devices to coax yourself to stay focused on writing, perhaps you should not be writing what you're writing. And if this lack of motivation is a constant problem, perhaps writing is not your forte. I mean, what is the problem? If writing bores you, that is pretty fatal. If that is not the case, but you find that it is hard going and it just doesn't flow, well, what did you expect? It is work; art is work.
Ursula K. Le GuinThere is neither source nor end, for all things are in the Center of Time. As all the stars may be reflected in a round raindrop falling in the night: so too do all the stars reflect the raindrop. There is neither darkness nor death, for all things are, in the Light of the Moment, and their end and their beginning are one.
Ursula K. Le Guin