This is the 17010th most frequent Russian word.
спальный
"Спальный" means "sleeping" or "bedroom" when referring to something related to sleep or a residential area.
Here, "спальный район" refers to a residential area, emphasizing the word "спальный" as something related to dwelling or housing.
Этот дом находится в спальном районе города.
This house is located in a residential area of the city.
In this context, "спальный мешок" refers to a sleeping bag, showcasing "спальный" as pertaining to sleeping.
У меня очень удобный спальный мешок для походов.
I have a very comfortable sleeping bag for hiking.
Here, "спальная мебель" is used to describe furniture intended for a bedroom, demonstrating "спальный" in the context of a room designed for sleep.