What is "dvalinn"

In Norse mythology, Dvalinn is a dwarf who appears in several Old Norse tales and kennings. The name translates as "the dormant one" or "the one slumbering" (akin to the Danish and Norwegian "dvale" and Swedish "dvala", meaning "sleep", "unconscious condition" or "hibernation"). Dvalin is listed as one of the four stags of Yggdrasill in both Grímnismál from the Poetic Edda and Gylfaginning from the Prose Edda.