Asked by Lorrie Davids⁽⁴²⁸⁾ 224 days 5 hours ago.

When hibernating, do bears ever wake up during the winter?

Answer from Lorrie Davids⁽⁴²⁸⁾ 87 days 20 hours ago.
Yes but usually not on their own. They can be awakened and will take the action required - like run, attack. But, unless bothered a bear's hibernation can last up to 7 months. The bears metabolism slows so that all he needs to survive is air.