Revised Edition
Your mind keeps reminding you of things when you can't do anything about them ... As soon as you tell yourself that you might need to do something, ... there's a part of you that thinks you should be doing that something all the time. Everything you've told yourself you ought to do, it thinks you should be doing right now.
— Getting Things Done by David Allen (Page 25)
I experience this so often - most acutely on the weekend when I am trying to spend time with the kid and the wife but I know I need to do some other things... Writing those things down doesn't relax me in those cases - although I'd certainly be even less relaxed if I hadn't written them down on a system I trust.