Grab your laptop and head to the nearest Starbucks or coffee shop. I find I need to constantly change locations at least every four hours to keep productive and prevent my mind from going "stale". Thank god I work at a university where I can just hop around from the library to other common areas.

Try changing where you usually sit and work in your apartment. I sit in all kinds of weird places. My new favorite place is on top of my desk. Don't knock it until you try it.