Hello, Tracie.
Rocket had a scare today. He was pale and his eyes were closed. However, they closed in a way that tells you "I need help" with the sunken eyes. He was having a very hard time breathing. I hesitated, but then I told myself, "Don't be an *****, do something!"
My mom and I poured cold water on him to revive him. He started pooping almost right afterwards. He opened his eyes and seemed half-heartedly alive. He was still pale with a dark beard. He was still breathing.
We did the cold water treatment again, with some warm water. He pooped some more. After the treatment, we put him down on the tile. He was doing fine. After about 10-20 minutes, his breathing became normal and his color returned to normal.
There cannot be any explanation for this other than old age and/or pain from poop. I checked his vivarium which was clean and had no sharp surfaces. He could have slept in a harmful position. The possibility of eating a firefly is slim to impossible. Fireflies are very rare around here and it would be even rarer for it to get in a house and it would be even rarer for it to get in the tank...