das Schlafzimmer
bedroom
A room in an apartment or house that is mainly used for sleeping.
Im Obergeschoss befinden sich das Bad und drei Schlafzimmer.
The bathroom and three bedrooms are located upstairs.

bedroom
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bedroom
A room in an apartment or house that is mainly used for sleeping.
Im Obergeschoss befinden sich das Bad und drei Schlafzimmer.
The bathroom and three bedrooms are located upstairs.

'Schlafzimmer' (bedroom) is a very logical word. It is made up of the verb 'schlafen' (to sleep) and the noun 'das Zimmer' (room). So it is literally the room for sleeping.
Unser Schlafzimmer ist nicht sehr groß, aber gemütlich.
Our bedroom is not very big, but it is cozy.
The pattern 'activity + Zimmer' is very common in German. When you see '-zimmer', you can often guess the function of the room, as in 'Wohnzimmer' (living room), 'Badezimmer' (bathroom), or 'Arbeitszimmer' (study/home office).
Das Arbeitszimmer befindet sich direkt neben dem Schlafzimmer.
The study is located right next to the bedroom.
Pay attention to the case used with prepositions. Movement into the room is expressed with the accusative ('ins Schlafzimmer gehen', to go into the bedroom), while a state or action in the room requires the dative ('im Schlafzimmer sein', to be in the bedroom).
Die Kinder gehen jetzt ins Schlafzimmer.
The children are going into the bedroom now.
children's room
'das Schlafzimmer' and 'das Kinderzimmer' are both rooms in an apartment or house, and you can sleep in both of them. The difference lies in the purpose and the person. A bedroom is generally the room where adults, or also one person, sleep. A children's room is specially set up for children; they often sleep, play, and study there. Learners may confuse the words because a children's room can also be a sleeping room. If you only mean the room for sleeping, 'Schlafzimmer' fits. If you are talking about a child's room, 'Kinderzimmer' is more precise.

Im Schlafzimmer steht nur ein Bett, ein Schrank und eine kleine Lampe.
In the bedroom there is only a bed, a wardrobe, and a small lamp.
Nach dem Spielen räumt Lisa das Kinderzimmer wieder auf.
After playing, Lisa tidies up the children's room again.