I knew I should have got up from my desk and gone for a walk when I had the urge for fresh air at 3 o’clock. I knew I shouldn’t have gone back to my desk after dinner. I knew I should have stopped working about thirty minutes before I did. I knew, I knew, I knew. Yet despite this deep sense of knowing, I let the ego-driven part of my mind (the part that says go on, keep pushing, just do a bit more; the part that knows what I want but not what I need) dictate my behaviour. And I knew I would be paying for it later, which I am – lying wide awake in bed at gone midnight, exhausted but mind racing too much to be able to get to sleep. I knew, but I wouldn’t listen.