Candidates napping in the national university entrance exam may be due to a variety of reasons. Some possible explanations for this behavior could include: 1. Exam fatigue: Candidates may be feeling exhausted from studying and taking exams for an extended period of time, leading them to feel tired and in need of a short nap. 2. Anxiety and stress: The pressure of performing well on such an important exam may cause candidates to experience high levels of stress and anxiety, leading them to feel overwhelmed and in need of a break. 3. Lack of sleep: Candidates may not have gotten enough rest the night before the exam, causing them to feel sleepy and in need of a nap during the test.