I think part of it might be how well-defined the task is. When a task is very well-defined, I can whip through it. When I have to decide how to do things (like how best to organize this report), it drags and drags. Anyway, I really should get to doing this. So I'm just going to do it and not worry too much about the format. If people aren't happy with it, thry can let me know.
My supervisor just called, and we're going to meet to discuss some things at 1 today instead of at 11, as originally planned. That gives me tie to finish up the report before I meet with him. The report isn't necessary for the meeting, but it gives me a deadline, which in itself provides motivation. Yes, it's a self-imposed deadline, but I can be good about tricking myself like that. So, I will get this report done by 1.