Wouldnt the best sleep destroying spell be Nightmare? Disrupts rival casters.
I'd probably invest in some scrolls of mordy's disjunction, as well as some mindblanks as well.
I'd summon demons and devils. Use willsave spells on fighters and fort save spells on wizards and reflex saves on clerics. I'd probably makes teleport traps to inhospitable environments. I'd make up rumors of magical items in dungeons, build random traps, and fill it with random monsters, while heaping piles and piles of gold in the middle room for them to find, just because they earned it. I mean, uh I would invest. I'd shanghai them. Or even better, I'd combine teleport traps with shanghaiing. I'd make epic level spells with the intent of killing specific pcs. whatever, there is a lot of stuff to do.