it's better for whoever is sleeping to mark targets so the tank and the rest of the team is aware who they should and shouldnt attack, also when dps attacks 2 different targets then they are pulling aggro 2 different ways and thus making the tank use overpower more and more. when the team concentrates on enemy at a time it's almost impossible for the tank to lose aggro (unless they are new). the main thing about this game is to be polite and ask questions, if everyone knew everything then what's the point of playing this game?... we came here for new experiences right?