Well I have been playing with a Sorc only once so I can't say for sure, but I think a sleeping mob doesn't build up any enmity towards anyone. If the sleeping mob built up enmity than it would run to a healer after the sleep breaks and would not start attacking the sorc, because healing aggro should always be applied globally.
And that exactly is what I noticed in Aion and that is the way it was in WoW. The exception to WoW could be that a rooted mob builds up enmity towards a healer, but not a sleeping or maybe cursed one.
This post has been edited by Ankh: 27 July 2009 - 05:28 AM