I would make sure he has a few suitable toys to chew on, and maybe consider putting a little smear of something tasty (like peanut butter) on one toy or another to make it extra-interesting. (For peanut butter or anything similar, of course you should not give him large quantities of it, because that would probably make him fat.)I think he seems bored, most of the time he likes to sleep, but recently he's been getting into things, like opening bags of flour in the pantry, or chewing up a silicone mat sort of thing.