i was soaking Captain the last night, and he started head bobbing. at first he would dunk his head, and when he lifted it up he would make slurping noises. then he started head bobbing several times over. i took him out and rubbed his neck to make sure he wasn't choking, and he was fine. when i woke up today he was under his bush and he yawned, then head bobbed a few times. what does this mean??? i got a bearded dragon a month ago and they head bob to show dominence, but he hasn't done it yet...