We have been to the vet, and he tends to think that maybe he isn't getting enough activity during the day. It still doesn't explain the smell. He does not have any problem chewing food, no vomiting. It's pretty much every night.
He recently sprained a paw and has been hopping for five weeks. It has been xrayed, and no breaks, but he acts a little depressed.
The licking started over 6 months ago and is worse on some nights. It usually starts on a leg or an arm (mine or my husbands) and then works its way to the sheets.