Beware rousing the sleeping bear

And also Bödvar Bjarki:

The famous poem Bjarkamál (of which only a few stanzas are preserved but which Saxo Grammaticus presents in the form of a florid Latin paraphrase) is understood as a dialogue between Bödvar Bjarki and his younger companion Hjalti which begins by Hjalti again and again urging Bödvar to awake from his sleep and fight for King Hrólf in this last battle in which they are doomed to be defeated. As explained in the prose, this rousing was ill-done, as Bjarki was in a trance and his spirit in the form of a monstrous bear was already aiding Hrólf far more than Bjarki could do with only his mannish strength: as Bjarki puts it on awakening, “You have not been so helpful to the king by this action as you think.”