A room specifically for sleeping, in a house or apartment.
この家には寝室が三つあります。
This house has three bedrooms.
寝室の窓から朝日が差し込む。
The morning sun shines in through the bedroom window.
He quietly entered the bedroom.
Since I was tired, I decided to rest in the bedroom.
I tidied up the bedroom before the guests arrived.
At night, I close the bedroom door.