I think the worse thing is going through the next day in your mind all the stuff you have to do and the order that you have go about it to be able to get it all done,keeps me awake.
I have to consiusly retake control of the thoughts cause they just run away with all these different senarios that end up shitn me with no real answer. I find another way is to list and write down the dudes I have to ring or the crap i have to collect and in which order etc is one way of getting it out of my head too.