What is the origin of the idiom "snug as a bug in a rug" and when to use it?

The origin of the phrase "snug as a bug in a rug" is uncertain, but it has been used for a long time to describe a state of complete comfort and coziness. This idiom is frequently used in casual conversations, especially when discussing comfort, relaxation, and the feeling of being snug and well-protected. It can be used in various settings, such as describing a cozy home, a comfortable seating arrangement, or even the satisfaction of a well-executed plan.