Agreed, and my preference is for the latter.
Cleon, can you live with one of those two, and which one?
The different versions are a bit contradictory:
X2 version requires save vs spells, which sounds something like making this Su/Will.
MMC version is save vs poison, which sounds like Ex/Fort, but then it has the whole bonus for critters resistant to sleep or charm spells.
SCMC (deadly) version is save vs poison with no modifiers.
So that's split. I lean very slightly toward Ex/Fort, but I could see writing in a bonus for elves (like the ghoul). Might still want to break out the dice.
Hold on a second, we were doing two variants weren't we, a "big patch" that causes days of sleep and a "little patch" that causes a few hours/minutes of sleep.
How about we give the little patch a Su/Will "spell pollen" that causes instant sleep, and the big patch version an Ex/Fort "poison pollen" that causes drowziness for its initial effect and days of sleep as its secondary effect?
Making the big patch version's sleep effect secondary poison might explain why it's so big - it makes it more likely its victims don't wander out of it before falling asleep.
Hmmm, exhausted as primary damage, sleep for secondary? Sure!
Ok, which variant first?