Xa'an was the first to dream of change in the universe, and when that change came about he gave the dreaming itself form in Oreb Nahash, who controlls the Dreams Domain
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The Dream Domain is not just the night-images that mortals experience, rather it is the possibilities, hopes, and wishes of existence. The domain encompasses the alternatives that the mind produces each night but also the desires and visions for the future that are harbored by all creatures, mortal and divine alike.
The Dream Realm, a plane created by Oreb Nahash, is where all these alternatives exist, where all the things that could have been and might yet be go to dwell and sleep and dream themselves.
Mortals looking for visions of possibilities and understanding of their dreams often pray to the god of dreams.