"Disillusionment of Ten O'Clock" is a poem from Wallace Stevens's first book of poetry, Harmonium.
The poem allows the reader to linger over the possibility of colors, strangeness and unusual dreams.
He believed that the imagination was an overlooked tool with the innate capability of distinguishing a mundane life (i.e. the lives of those who wore 'white night gowns' to bed) from an exciting and fulfilling one.
This follows one of the main facets necessary for modernist literature to function: that the object or idea being represented exists in and for itself.
On this reading, the poem is not an indictment of middle-class values, though that is one interpretive option, but rather the "haunted house" of white night-gowns represents life without imagination.