The news can sometimes penetrate our defenses. Then there are relationship problems and big and small disappointments which accumulate during the day. Sleep and dreaming might be able to process some of that but it seems that unless we learn to deal with it, daily life has the potential to poison us little by little, unless we figure out a way to process difficult moments.
Writing (but not exclusively about bad stuff, because that can get depressing as well) is one such waste disposal or at least purifying mechanism. What other methods do you have to dispose of the accumulated negativity? What is your waste disposal?