Find a pointless computer game, preferably multi player so others an enjoy your mood. I'd recamend a 1st person shooter, TFC or Counter-Strike are my favorites. Then play till you fall asleep on the keyboard, but make sure you buy something to protect the keyboard from drool!
Playing like that's really relaxing and mindless, well for many playing it probably takes all their mental energy, but for normal awake people its mindless.
