Mouth open? Sleeping?

[Reptarmama]

Hey guys. Reptar is about a year old. I have not changed his conditions at ALL. He seems to be eating fine, moving around fine, etc. We DID do a bit of handling today.
I have caught him with his mouth open a few times- which concerned me. If I look at him, he stops. However, I caught him SLEEPING with his mouth open? That has me worried. He doesn’t have extra saliva, he doesn’t look like he has trouble breathing, his nose isn’t in the air.

What could be going on?

 

[Sonny13]

They do it when too hot (but you’re saying you having changed anything) or when starting to shed (to break the old skin around their face) and my parsons does this in morning (always the last fogging session) while sleeping when fogging, like she wants the fog to enter her mouth.

If there’s no popping sound, nose in the air or extra saliva, then just keep a close eye on him.