Bears don’t actually hibernate. I forget the word offhand, one can look it up.
According to google:
It is a common misconception that bears hibernate during the winter. While bears tend to slow down during the winter, they are not true hibernators. Black bears, Grizzly bears and Brown bears do go into a deep sleep during the winter months, known as torpor.
I believe the word you are looking for is torpor.
“I forget the word offhand”
Chill is the word you’re looking for.