The antonym for the phrase "day rest" can be either "night work" or "all-nighter." While day rest implies taking a break during the day, night work refers to working throughout the night instead of resting. Similarly, an all-nighter is staying up all night to complete work, study for exams, or engage in any other activity that involves no rest during the night. Both night work and all-nighters can be exhausting and detrimental to overall health and well-being. Therefore, it is essential to rely on proper time management and take quality breaks during the day to avoid the need for a night shift or all-nighter.