this morning my girlfriend seen him yawn and i witnessed it tonight a few times he submerges his head in the water rubs against the water dish and then yawns and repeats, when he submerges his head in the water sometimes blows bubbles is this something to be alarmed about, i have read yawning can be a sign of RI> but haven't found anything on the bubble blowing and don't notice any mucus
here are some pics

head submerged


yawning


head looking up (sign of RI?) doesn't do it long tho