Impatience.
Normally i am prepared to wait for as long as it takes to get what i need ingame. I once spend 14 hours in Fallen Gate to get a quest update, killing placeholders every 20 minutes until i had the update i wanted.
However i now find i'm staring at my Tradeskill experience toolbar trying to will the Vitality to increase so i can do more writs. I could always do they with my vitality at 0% but would like to gain more exp.