noun
Dated term for a place to sleep, such as a bedroom or bedchamber. Modern Japanese more commonly uses 寝室.
昔の家では、寝所は畳の部屋だった。
In old houses, the sleeping place was a tatami room.
noun
roost; nest
Dated term for a bird's roost or nest. Now mostly replaced by ねぐら.
鳥たちは夕方になると寝所に戻った。
The birds returned to their roost in the evening.