Whell not really histeric, but let say very very active. I've noticed in my tegu this frequent behavior: he roams around the room very quickly and actively licking and climbing on anything, especially the sofa. He seems like he wants to eskape from the room or at least climb to the highest point. He looks up and he wants to go up somewere. If I sat down in front of the sofà he climbs on me using my body as a bridge for the sofa. He is so active he jumps from a sofa to another. I usually let him in the terrarium until three pm, then I let him out giving him the entire room to roam around. This room has an open window door so he has many hours of direct sunlight in the afternoon for basking (in the terrarium he also has obviously a uvb light). I'm sure is not hunger or thirst (I've tried feeding him in this circumstances but he is not interested). Neither searching for a place to hide (he have access to the terrarium with plenty of substrate and places to hide into). He usually have this behavior after having plenty of direct sunlight. Could it be the result of a good sun warm up, with battery recharge and excitement ? Did none of you ever noticed this kind of behaviour ? He is not really aggrressive, he simply is unrestrainable (i don't know if the word is correct), like he was saying: "don't stop me, i have to go". I have a cat in the house, bute he is not allowed in the room (there is like a gate between th too rooms) could it be that he smells the cat and he is excited by the smell ?