Sometimes pressure can feel like it is right around the corner, on top of the rock, ready to attack. When it seems impossible, we procrastinate. We wait until we can have a “perfect” approach to the situation. We forget that it is impossible to that.
Certainly, doing work when you are sick or you just really can’t concentrate is not a good idea. I have found, however, when you work when a task is newly assigned, your energy and your understanding of the task is still on it’s peak.