The phrase "hush of night" conjures a sense of quiet and stillness that is unique to the darkness. If searching for synonyms to describe this feeling, it's important to consider words that evoke a sense of peacefulness and serenity. Examples include "calmness of night," "tranquility of evening," "stillness of midnight," "quiet of dusk," "serenity of twilight," and "peacefulness of the wee hours." Each of these phrases can help to capture the essence of the "hush of night," and are perfect for painting a vivid picture of the quiet moments that define the darkness.