2.) appropriate music - I cannot work without headphones, and appropriate music on, its more of a tool to drown out the rest of the world.
3.) caffine, cold - at work i drink coffee... its just not as effective. I used to drink a lot of red bull, but my heart started to feel funny so I switched to coke.
4.) Interest - I need to get myself interested in what i'm working on, this is incredibly difficult to do with job work. I'm still working on solving this one.