I really pushed myself hard between 2007 and 2010, working my nuts off, on more than one occasion working continuously over a weekend to hit a monday deadline.

I really pushed myself hard between 2007 and 2010, working my nuts off, on more than one occasion working continuously over a weekend to hit a monday deadline. Unfortunately, this succession of gruelling 60+ hour long crunches meant that I came off the boil a bit in 2011 and 2012 -- and 2013 has been a total write-off, from a productivity perspective. As I enter 2014, I feel like I am back in the game (a bit) but wonder what I can do to keep the fires burning whilst also staving off the consequences? I far prefer working hard than the long months of tiredness and weary fatigue with no immediate cause, and whilst getting from one state to another feels easy, getting back again seems rather more difficult and time-consuming.