Anything at all that distracts my mind away from negativity. Coffee, a tv show, meditation, reading, going to the store and buying something nice, etc. Could be anything, whatever works. But the number one thing that really always resets my brain and clears away all of the stress and negativity, is a couple of hours of sleep. Anywhere from 2 to 4 hours of solid sleep and my brain is wiped clean for a period. With me I think it's a neurological thing, not psychological.