I have a bad habit of lying in bed at night creating a mental list of all the things I did NOT accomplish during the day. Actually, fixating might be a better word. Given the fact that I always have more to do that could ever be accomplished in one day, plus my predisposition for feeling a little frantic and inadequate in general (with respect to this school/research game), this is not a productive act.
So, instead I have been willing myself to forget the 'To-Do' list and instead compile a mental 'Accomplished' list. A little mental checklist of all the things I did work on, attend to, think about, or (gasp!) finish (!) during the course of the day. A little psychic pat on the back before I nod off.