That's a great anecdote and good advice too. I heard something similar once about 'if it's not flowing like it was, at least write 50 words a day. Tell yourself you
mustwrite that 50, but
need write no more.'
I've found that quite helpful - it's an achievable goal and keeps the story alive and focused on until your Muse wakes up.
Not much good if you have a deadline swinging over your head though