There are many synonyms that can be used for the phrase "in the hours of night." Some alternatives include "in the wee hours," "during the nighttime," "in the dark hours," "after dark," and "while most people are sleeping." These phrases all convey a similar meaning of a period of time during the night, typically after midnight and before dawn. Whether it's staying up late to finish a project or experiencing the quiet stillness of the night, these synonyms can be useful for adding variety and nuance to your writing. So, next time you're describing the late-night hours, consider using one of these alternatives to make your writing more interesting and engaging.