Is my beetle go hibernation?

Well, I need a bit info about beetle's live.

Because I'm the first time from got pet atlas-beetle (5cm male) from ago on Wednesday.
He had a lot of walk in his terrarium, a a bit sleep.

Then, He ate close all jelly by one jelly-cup 16g in single day.
Then go at sleep. He almost sleep 2day in wood's under and dug in the ground to make a "nest".

I rub a little to him. He has to move, but still want to sleep. Before I am worried if he would be dead.

I read google said: The beetles use hibernate if feel cold. But, my room is warm.
If he know here now December are winter?

Sorry poor english.