The fact that Maniac lies down to take a nap contributes to the plot by ?

Maniac lays down to take a nap in order to clear his head so that he can prepare himself for what comes next.

After polishing off the Krimpets, Maniac did the last thing anybody expected: he lay down and took a nap right there on the
table, the knot hanging above him like a small hairy planet, the mob buzzing all around him. Maniac knew what the rest of
them didn't: the hardest part was yet to come. He had to find the right routes to untangle the mess, or it would just close up again like a rock and probably stay that way forever. He would need the couch of a surgeon, the alertness of an owl, the cunning of three foxes, and the foresight of a grand master in chess. To accomplish that, he needed to clear his head, to flush away all distraction, especially the memory of the butterscotch Krimpets, which had already hooked him.