dor·mouse 
(dôrmous′)
(dôrmous′)n. pl. dor·mice (-mīs′)
Any of various small omnivorous rodents of the family Gliridae of Eurasia and Africa, having long furred tails and known for their long hibernation periods.
[Middle English, perhaps alteration (influenced by mous, mouse) of Anglo-Norman *dormeus, inclined to sleep, hibernating, from Old French dormir, to sleep; see DORMANT.]