The Death Of CC

[Edellis]

unless you're like level 27 and your tank cant seem to do basic pulls (or you got some silly DPS proximity pullling random mobs) you should not even be thinking of using Sleep. Waste of MP.

It may be useful in dungeons where you are missing a tank/healer, or you're doing a challenge run (4DPS, no heals, no tanks, ect ect) but generally speaking any strategy where you're sleeping mobs is easily outdone by doing pretty much anything else.