Sleep makes the target unable to move, attack or use any arts. Attacking a sleeping target results in a guaranteed critical hit at the cost of waking it up. Sleep will otherwise last its whole duration. Sleeping party members can be woken up. Doing so will boost the Affinity between the two characters. When inflicted on an enemy in the middle of a Vision, Sleep, like Daze, will postpone the vision until the target recovers. In addition, the vision will change to a different art. When seeing a vision with a lethal art, inflicting sleep can change it to a less dangerous art.