My bet is it mostly just needs to be cleaned. I've had very little servicing done on the thing since I bought the house, so it probably deserves to be cranky.
Needless to say, having a pair of pit bulls also helps me worry less about cold weather! They make very good bed-warmers. In fact, I had three last night, since Gloria spent the night here so her person could get a good night's sleep before her first day at a new job. They all want to be on the bed, and three pit bulls and me in one bed -- even a queen bed -- is a neat trick.