Ever have sessions when you can't remember rules that you've used every week. You can't recall how the game is supposed to work or the motivation for the NPCs simply escapes you? I know I have. When the creative juices flow not except to random places that aren't helpful. I mean really, coming up with a new way to use cleric spells is all well and good but doesn't fix the problem of the players asking about lore that I haven't thought up yet. Brain Freeze! It's like an ice cream headache (save ends).