A: Were you comfortable in your new bed last night?

B: Of course, I was as snug as a bug in a rug.

Note: This idiom means “very warm and cozy, typically while wrapped in blankets.” To many denizens of regions that experience frigid weather, the expression will likely conjure thoughts of being warmly wrapped up in blankets or tucked into bed and protected from the cold temperatures outdoors. The phrase first appears in print in the late 18th century. Rhyme is likely the reason bug was introduced into the phrase, since the bug is in a rather precarious position in a rug, especially in a home with cats.