I learnt a new word today: Hypergraphia. Described as the compulsiton to "scrawl away constantly, scribbling on notebooks, napkins, walls, even skin." Or your blog, perhaps...
"Manic depressives with a predisposition to chronicling their lives or composing poetry are likely to engage in voluminous writing in their darkest hours."
Do you get grumpy and make snarky blog posts in the wee small hours of the morning? Blame hypergraphia.