Hello, i have a 11-year old leopard tortoise. He occasionally makes these loud exhale noises before sleep. It doesnt happen any other time and it doesnt happen every day or even every week. Have you experienced this kind of behavior and what you think it is? It is not the hissing sound, im familiar with it, and it only happens when he is hidden and getting ready for sleep. He is completely healthy and no breathing issues. No wet nose. Temperatures never drop below 23 celsius (73-74f). Basking area is 40 celsius (104f). He has been doing this for years but then i got worried because i have been reading they should be completely silent… i guess im just paranoid. If you have similar experiences i would like to hear, thanks.