" 'white' sleep"

[Jonathan Lighter]

In his 1957 novel _A Death in the Family_, James Agee uses the term "a ' white ' sleep" [Agee's single quotes] to describe the very troubled sleep of an anxious character. The story is set in Knoxville, Tenn., in 1916.

Is anybody familiar with this phrase?  The quotation marks seem to imply that Agee regarded it as idiomatic, but I can find no other reference to it.

JL


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