Somnorific, derived from the Latin word "somnus" meaning "sleep", refers to something that induces or causes drowsiness or sleepiness. Its opposite or antonym would, therefore, refer to something that is invigorating, stimulating, or energizing instead, such as lively, dynamic, energetic or rousing. Other antonyms for somnorific could include exhilarating, uplifting, refreshing, or exciting. Some examples of activities or substances that could be considered antonyms to somnorific include sports, exercise, caffeine, or bright natural light. Whether you need to stay alert for work, study or other activities, understanding the opposite of somnorific can help you find ways to stay awake and focused.