stillness of night; quiet of the night
Poetic expression for the deep silence and stillness of nighttime.
夜のしじまに包まれて、遠くの虫の音だけが聞こえた。
Enveloped in the stillness of night, only the distant chirping of insects could be heard.
夜の静けさ is a more everyday expression for 'quiet of the night', whereas 夜のしじま is more literary and poetic.
Common kana-mixed spelling; しじま is often written in kana.
Kanji spelling using 静寂 for しじま; less common but still encountered.
Compound of 夜 (night) + の (possessive particle) + しじま (stillness, silence). しじま is a native Japanese word of uncertain origin, often associated with the idea of complete quiet.