One loop hole based on the tech behind SAO:
Sleep PK should not be possible. All players' actions are directed via their neural pulses from their brain. Another player using a sleeping player's hand should not be able to make anything happen in game as there will be no neural pulses coming from the sleeper player to make the action occur. Another words, even if the duel request prompt appears, there is no way for someone to use the sleeping player's hand to click on the OK menu button since the action of clicking OK should only come from the sleeping player's brain.
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