This may sound odd but it worked for me: Rearrange the room you work in. Spend a day cleaning and rearranging the furniture of your room. I moved my desk from

This may sound odd but it worked for me: Rearrange the room you work in. Spend a day cleaning and rearranging the furniture of your room. I moved my desk from facing a wall to facing outdoors and the small change in scenery helped me be more productive. Sometimes familiar environments become stagnant. I personally like to see change around me because it invigorates me (which is why I can't run on a treadmill).