Dear Abby: I my husband's excessive yawning just annoying or a health problem?

Dear Abby: My husband yawns loudly over and over when we are watching TV in the evening. I have asked him to please not be so loud when he yawns, and he gets annoyed that I asked. He still yawns loudly many times a day.

How do I get him to stop making a production of his yawning?