Once and awhile my cat will start licking an object and I will not be able to get him to stop. It started again last week and he has taken to licking my bedspread. I washed it and it seems that he smells the spot where he just sat and starts licking even after I have washed it. It's is usually a spot where he had been occupying or another one of my cats. This behavior usually only lasts a week or two but it gets annoying in the middle of the night when he does it. I've taken him to the vet and they're no help everything is normal except the fact he is a big boy (18 lbs). Anyone have anything similar with their cat? Any ideas why this happens?