Profane's disassembling dream dream?

[Ron Judy]

Harper Perennial ed. p 39-40:

"In this dream, he was all alone, as usual. Walking on a street at
night where there was nothing but his own field of vision alive. It
had to be night on that street. The lights gleamed unflickering on
hydrants; manhole cover which lay around in the street. There were
neon signs scattered here and there, spelling out words he wouldn't
remember when he woke.
  Somehow it was all tied up with a story he'd heard once, about a boy
born with a golden screw where his navel should have been. For twenty
years he consults doctors and specialists all over the world, trying
to get rid of this screw, and having no success. Finally, in Haiti, he
runs into a voodoo doctor who gives him a foul-smelling potion. He
drinks it, goes to sleep and has a dream. In this dream he finds
himself on a street, lit by green lamps. Following the witch-man's
instructions, he takes two nights and a left from his point of origin,
finds a tree growing by the seventh street light, hung all over  with
colored balloons. On the fourth limb from the top there is a red
balloon; he breaks it and inside is a screwdriver with a yellow
handle. With the screwdriver he removes the screw from his stomach,
and as soon as this happens he wakes from the dream. It is morning. He
looks down toward his navel, the screw is gone. That twenty years'
curse is lifted at last. Delirious with joy, he leaps out of bed, and
his ass falls off.
   To Profane, alone in the street, it would always seem maybe he was
looking for something too to make the fact of his own dissassembly
plausible as that of any machine. [... skipping paragraphs] This was
all there was to dream; all there ever was: the Street."

Things fall apart...An early foreshadowing of V.'s final disassembled
demise...The screwdriver symbolism of the flaneur?

What is the meaning of this dream within a dream?