Question!!

I have a argentine tegu, and i believe for him to be around 5 monthes in age. When I first bought him he was eating fuzzie mice basically everyday, and lately for the past three days he hasn't eaten any, and I have offered him some, along with egg's. He has had crickets in the past too, but hasn't eaten the mouse yet. He tends to burrow for a majority of the day until I get him out, is there a chance he could be hibernating? The temperatures are correct and his humidity level is fine too, is there something I am doing wrong?