Do you need some more magic in your game? Maybe a few secrets would suit your fancy, but beware the price inherent in this particular spell. GMs could consider tying in elements of the knowledge gleaned to the very nightmares that prevent the caster from gaining rest.
School divination; Level sorcerer/wizard 1
Casting Time 1 standard action;
Components V, S
Range 25 ft.
Target One humanoid target
Savings Throw Will negates; Spell Resistance Yes
Upon completing the spell, you instantly know either the target’s greatest fear or its deepest desire, GM’s choice. This knowledge grants a +5 circumstance bonus to all skill checks made to influence the target as well as a +5 to your spell save DCs when using the information gleaned against the target to influence it. Using this spell has consequences: The next time you sleep, you have terrible nightmares that prevent you from enjoying restful sleep. You are shaken and fatigued until after a remove curse (or another similar more powerful spell) is cast on you get at least 8 hours of restful sleep.