The term 'NAP SACK' can be broken down into two crossword solutions: BED and COT. A BED is a piece of furniture used for sleeping, typically consisting of a mattress on a raised frame. It is usually placed in a bedroom or other sleeping area. A COT is a small, portable BED, often made of metal or canvas, that can be folded up for storage or transport. It is commonly used for camping or as an extra BED in a home. Both beds and cots provide a comfortable place to sleep, but a BED is generally larger and more permanent than a COT.