Which term describes a room used primarily as a sleeping area in a house?

The term that best describes a room used primarily as a sleeping area in a house is "bedroom." This designation is well understood in residential architecture and real estate contexts, where a bedroom typically contains a bed and is specifically designed for rest and sleeping. It is characterized by its functions, which include providing privacy and comfort for the occupants.

In contrast, other options refer to different types of rooms with distinct purposes. The living room serves as a communal space for relaxation and socializing, a study is designed for work or study activities, and a storage room is intended for storing items rather than for any habitable purpose. Understanding these designations helps clarify the specific roles that different spaces within a home fulfill.