Well, here's my most recent experience with dogs on my lap, under my chair, under the desk, laying on top of me.

High winds.
Next morning I discovered coyote foot prints in this area of the place (coyotes have been staying out of the area the dogs have access to)

Earlier
Neighbor screaming curses at someone (in the middle of the night, in the morning, in the afternoon)

Way back in Wyoming
Starlings moving about in their nest in the wall.....

Since this is persistent - trip to the vet.
If that solves nothing, have your house checked for carbon monoxide levels. Or critters.

Re trip to the vet - BTY2 tore a toenail nastily last night = trip to the vet today = lighter wallet.

So if he isn't sick, there's something wrong at your house.