Usage Note
Nachtruhe refers both to the period of sleep and to the legally protected quiet hours during the night. Die Nachtruhe einhalten = 'to observe the quiet hours'. German house rules (Hausordnung) typically set Nachtruhe from 22:00 to 06:00.
Examples
"Ab 22 Uhr gilt in der Wohnanlage die Nachtruhe."
Natural Translation
From 10 p.m. the night-time quiet hours apply in the residential complex.
Literal Translation
From 22 o'clock applies in the residential-complex the night-rest.

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