Lyrics question

[Jeff Berry]

>OK, so, I'm reading one of the new Chaosium Cthulhu fiction anthologies,
>and there's a story by Karl Edward Wagner titled "The River of Night's
>Dreaming."
>
>This sounds very familiar, but I can't place it.  I'm almost convinced
>that it's from a song...  There is another story by Robert Chambers
>titled "The King in Yellow", which of course was used in a BOC lyric, and
>I'm wondering if "the river of night's dreaming" sounds familiar because
>it was used in a BOC song.

Well, I doubt this is the original source, but there's a line from
from the Rocky Horror Picture Show  -
the darkness must flow down the river of night's dreaming,


JB