Interesting Concept

I found this out Wow.Com http://www.wow.com/2009/07/09/breakfast-topic-different-states-of-rest/; an absolute must read daily informational source about the World of Warcraft. The idea of different levels of rest, effecting your toon differently would add a new twist to the game. At the level of exhaustion, one could be required to eat or drink to retain there overall energy levels. I believe this is being done in some MMO's already.