1660s, from Latin hibernationem (nominative hibernatio) "the action of passing the winter," noun of action from past participle stem of hibernare "to winter, pass the winter, occupy winter quarters;" related to hiems "winter," from PIE *gheim- "snow, winter" (cognates: Sanskrit heman "in winter," Hittite gimmanza, Greek kheima, Old Church Slavonic zima, Lithuanian žiema "winter").
1. Bears wake up in the spring after a winter of hibernation.
2. At the first cold of autumn, many insects go into hibernation.
3. The tortoise spends the winter months in hibernation.
4. Hibernation is more than sleep.
5. But this spring occupants of the spider motels awakened from hibernation healthy and ravenous.