I am new to the tegu world and just got an Argentine black and white about a month ago now. Everything is going great with her and she is active and healthy. Three days ago I had to change out all her substrate and clean the enclosure. I added about two inches of sand/soil with a bag of hardwood mulch. I have noticed a huge difference in her sleeping and was wondering if anyone could help me figure out what would cause the sudden change? She is still eating great,has great bowel movements and is still very active. Before I changed everything out she was getting up around 9 or 10 am and went to bed at exactly 6:30 every night. Now she is getting up around 10:30 to 11 and is back in her hide for the night by three or four. Is there anything I should be concerned with or is it possible she is getting ready to go into hibernation? Temps and humidity is same as before