Answer:
Vikings use this for warmth.
This is in a realm of true and in a realm false, but you experience me as you turn and toss.
I weaken all men for hours each day. I show you strange visions while you are away. I take you by night, by day take you back. None suffer to have me, but do from my lack.
Two horses, swiftest traveling, harnessed in a pair, and grazing ever in places. Distant from them.
What has wings, but can not fly. Is enclosed, but can outside also lie. Can open itself up, or close itself away. Is the place of kings and queens and doggerel of every means. What is it upon which I stand? Which can lead us to different lands.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.