dormouse

Short definition from Wiktionary

Noun

1. 1
   Any of several species of small, mostly European rodents of the family Gliridae.
2. 2
   Any of several species of small, mostly European rodents of the family Gliridae: Glis glis (edible dormouse).
3. 3
   Any of several species of small, mostly European rodents of the family Gliridae: Muscardinus avellanarius (hazel dormouse).
4. 4
   A person who sleeps a great deal, or who falls asleep readily (by analogy with the sound hibernation of the dormouse).