Originally posted by darthsith19
Actually, if he were running out of Force reserve before even getting rid of Kenobi, by the time he got Anakin on his own he'd have no Force Reserve left to use for the fatigue, so yes, he would be tired then.
You're theorizing; speculation does not hold weight when in defiance with previously-established canon. The novelization says that Dooku revitalized himself with the Force when he was getting too fatigued. Ergo, he was not tired.