Falling asleep in class is a common phenomenon among students in Japanese universities. There are several possible reasons for this: tiredness from daily routine such as commuting, difficulty concentrating in 90-minute classes, or simply a lack of motivation to study. In the English as a foreign language (EFL) classes, university students are usually not as motivated as high school students, considering that English education in Japan is generally aimed at preparing students for university entrance examinations. This study, therefore, aimed mainly to examine ways to prevent students from falling asleep in class by improving their motivation levels. Based on the results of questionnaire surveys and focus group interviews, it sought to identify ways in which student attention and alertness in class can be improved. The participants in this study were asked to take a vocabulary test in class before completing exercises in their textbook. After four weeks, follow-up research was conducted using questionnaires and semi-structured interviews. The study results showed that taking a vocabulary test at the beginning of class was an effective method of motivating students; however, this alone did not prevent university students from falling asleep in class.