Amen brother (or sister, as the case may be). I really have a consistency problem. Much of that is not because I don't have lots to write, but because I feel guilty doing so. If I'm writing than I am not: cutting the grass, doing dishes, washing laundry, fixing the stinking downspouts, etc., or even just organizing the office, so I can feel like the area is uncluttered. If life is cluttered and my surroundings are cluttered than I feel cluttered and don't get much done.
When the wife was studying for her personal training exam, we would work at the same time, so neither had to feel guilty.
On a related note, I was re-reading Good Omens recently and read through the afterword(s). One note was that when Terry Pratchett wrote "The Colour of Magic", he did it at 400 words per day. This tells me that 'any momentum is good momentum'. Unless perhaps it is associated with a large slug of <insert any object type here> going at relativistic velocities towards your home world. But anyway...