About half way through November 2009, I was running behind in my NaNo word count, so I started getting up at 5:00 AM to write for an hour before getting dressed for my day job. I can write approximately 1000 words in an hour when I have a road map to follow. That schedule worked very well for me and put me over the top for NaNoWriMo well before the month was over.
In December I slacked off on my writing schedule due to the holidays.
After the first of the year, I screwed up my regular evening writing schedule by joining a new gym. I am working out longer after work on weeknights. That's very good for my health, but it cuts into my writing time during the week. I decided to revive my 1000-words-before-breakfast schedule. So far that has worked out well.
Fortunately for me, I'm an early bird, so getting up at 5:00 AM to write is not a problem. (Stopping at the end of the hour is sometimes hard.) Last week I wrote more than 11,000 words between Monday and Friday. That keeps my story moving forward. When the weekend rolls around I'm ready for my "long" writing sessions, I won't have to back up too far in order to remind myself where I was going next.
This schedule may not be for everybody, but I think it works for me.