Hello, I have a 2 and a half year old bearded dragon who is hiding in their cave and sleeping more than normal (not for sure of gender because there is trauma in their tail from before I got them but I call them a he). He is in a 55 gallon tank with a 100w basking light for day, and a 100w red light for night. The bulbs are both from zoo med and he also has a 18" strip UVB light that goes across the tank. There is also an under tank heater under the tank where the hide is that he's been staying in. The heater is usually around 90F. And now I may get backlash for this, but his substrate is Australian Desert Dragon Habitat Sand. I have done my research on it and I switch it out regularly to help avoid bacteria build up. Anyways I'm not sure if this is brumation or not because the temperatures in his tank don't fluctuate much. He's been hiding and sleeping in the cave day and night for the past 2 weeks. I do offer him crickets and collard greens in which he usually takes and still poops pretty regularly. He hasn't shown signs of illness but I'd like others opinions on if it's brumation, illness, or just a developed behavior?