I've definitely seen him do all of those things after past feeds, the yawning especially.
It's been roughly an hour, maybe just under than amount of time.
Hmmm...I would leave him alone and check him in the morning. If he doesn't have it sorted by then you may need to take further action. I don't think it's anything to be immediately alarmed about though.
Lucifer Sam, Siam cat...
Always sitting by your side,
Always by your side...
That cat's something I can't explain...