Call it a day. Wake up around noon. You'll be glad you allowed yourself the extra sleep, because you're going to be doing some intense writing today. Go to your work area and sit at your desk. Now get up, go to the kitchen, and make some coffee.
Nothing gets the creative juices flowing like a fine cup of coffee.
Go back to your desk and review what you wrote yesterday, which was, as you recall, absolutely nothing. That's OK, though. Take a sip of coffee. Call it a day. Chances are you had a good idea for a column in the middle of the night, but have now forgotten it.