Congratulations on the surgery!
I had sweats and needed my sheets changed often. There are many reasons why this could be happening and certainly some are minor. It should be something that you tell your doctor. Don't relent. If it's just a drop in hormones, then that will be an easy fix for you. Perhaps they have you on a plastic bed with just a sheet cover? That will do it for sure if you don't roll around much.
Chin up!
Cindi