My 2nd Ed books are the 'fill' in a landfill somewhere, but here's what the original DMG has to say:
(p.70)Magically Sleeping or Held Opponents: If a general melee is in progress, and the attacker is subject to enemy actions, then these opponents are automatically struck by any attack to which they would normally be subject, and the maximum damage possible according to the weapon type is inflicted each time such an opponent is so attacked. The number of attacks or attack routines possible against such an opponenet is twice the number normally allowed in a round. Otherwise, such opponents may be automatically slain, or bound as appropriate to materials at hand and size, at a rate of one per round. Note that this does not include normally sleeping opponents.