I was holding our little Yellow Belly with my back turned to the other cage when I heard a noise that was quite loud. It sounded like a mini-sneeze. I looked back at the cage, but both snakes looked normal. A breeding couple, borrowed male pastel and our 1600 gram female normal were still all coiled up. I turned away again and heard the noise. This time I watched them for about a minute and then I saw it. The female normal, Slyther, sneezed. It looked like she was pushing out all her air at once. She did this several times and since has done something similar but less extreme. It looks and sounds like she us sighing. Is this normal behavior?