Sleep clause as it currently works has the sleep move do nothing when it is used. I don't particularly know if there is a way to add this in the games (but i highly doubt it). If not sleep clause should be changed to act as taunt does and make it so a message tells you that you can't use the move. I know that it is the players responsibility to make sure that they don't have a sleeping opponent already, but if there is no way to make this happen in the games then sleep clause needs to be changed, just like team preview needed to be added.