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You can always get the seat where you like it an unhook the connectors to the power seat motor (or pull the fuses). You haven't pissed the wife off to the point that she's playing a cruel prank on you?
Do you have any kids old enough to drive? Since I don't see how it is possable for an electric seat motor to move by it's self, and from what you say it seems as if it's in the same possition every morning?
I place my bets on someone driving your truck while you are sleeping!!!!
Cujo has a good idea, remove the power from the seat and see if it still creaps down. That would rule out something electrical like a short or stray voltage .... or maybe the kids\wife.