My rats (2 months old) are sneezing. Sometimes it’s one, sometimes its like three in a row, but it is not consistent. I have read that this could be linked to respiratory issues, but they have no other symptoms. They ping, brux, boggle, play fight with their siblings, eat, socialize with me and other members of my family. They are not secreting porphyrin either. They do sleep a lot during the day, which I thought may be a symptom, but they are also still babies and are EXTREMELY active during the night. Should I be worried about the sneezing?