Energy Bolt: Additional sleep damage attribute…
Attack monster in [sleep] state with [Energy Bolt] to give additional damage of 50% of Magic attack
It isn’t 50%… Try something more like 5% per rank.
Too bad you can’t sleep bosses.
It’s ok vs normal mobs. In pvp though I’d rather drop a meteor on them while asleep. 
It’s kinda useless when you get your magic missle, or skill from other class such as pyro/cryo.
Sleep+magic missle is the craziest combo you can have. Instant AOE OHKO burst at rank 3.