Hudibras.
Nap, n. A short sleep; a doze; a siesta. Cowper.
Nap, n. [OE. noppe, AS. hnoppa; akin to D. nop, Dan. noppe, LG. nobbe.]
1. Woolly or villous surface of felt, cloth, plants, etc.; an external
covering of down, of short fine hairs or fibers forming part of the
substance of anything, and lying smoothly in one direction; the pile;
-- as, the nap of cotton flannel or of broadcloth.