Rested XP IRL

Do you see that purple leveling bar at the bottom of your (WoW) screen? Do you wish that it would go faster, and you could level quicker than normal? This might blow your mind, but if you logout in an inn or a major city that purple bar becomes blue! The blue bar means you gain more xp from questing and killing mobs!

Rested xp makes a lot of sense to me...