One of the interesting things I am learning about writing as a 'full-time' career is that you can't have brain dead days.
When you work in an office, unless you have a micro-manager, it is generally possible to fake it through a day when the brain isn't quite firing on all cylinders.
This is not the case when you are writing. If you are brain dead the words on the page are DOA.
I suppose that experienced writers probably set aside certain tasks to do on those days that the synapses just aren't firing.
I don't know. I can't really think of what to do. I'm having a brain dead day!