The term "bunk out" refers to the act of going to bed or sleeping, sometimes in a casual or informal setting. Some antonyms for this phrase include staying up, remaining awake or pulling an all-nighter. Other antonyms could include being restless, tossing and turning, or having insomnia. Additionally, if someone is unable to bunk out because of being preoccupied with responsibilities or tasks, this could be described as being busy, engaged or occupied. In contrast, if someone is deliberately avoiding sleep, they might be described as being sleep-deprived, overstimulated or simply resistant to relaxation.