"Long hibernation" refers to a prolonged period of inactivity or dormancy, typically associated with animals that go into a deep sleep during the winter months. Full definition
It seems like Paris is waking up from a very long hibernation. (violettedaily.com)
Although humans quickly lose power in their muscles if they don't use them, black bears retain almost all their strength during their long hibernation, according to a new study. (sciencemag.org)
In winter, bears are among the most inert mammals known; they don't even urinate during their 5 - to 7 - month - long hibernation. (sciencemag.org)