Yesterday I bought two 5-6 week old female rats that seem completely happy and healthy, but this morning one was sleeping on my shoulder and I could hear her occasionally quietly squeaking/making subtle noises and was also making a quiet clicking noise every breath for a while. While she was asleep she also occasionally twitched her feet and stretched. (which I assume is normal) Were the noises related to her dreaming about being away from her mum and old home, or a respiratory disease or something? She hasn’t made the noises since.(I don’t think)Neither of them show any other signs of a respiratory infection.