There are several reasons why the students become lazy in the class. First of all, the most common reason is that the students can’t follow the lesson well. Because of they can’t follow the lesson; their motivation to study will be decreased. They will think that there is no need to study if at the end of the class the will get failed. Second, they are affected by their own interest. With having their own interest to much, the time of their studying will automatically decreased as well. They will prefer to spend their time with the more interesting to them and not studying. Third, the student is affected by the family factors; this family reason can affect the student will of studying. The effort of a student who abandoned by their family and with the one who got support from their family will be different. So for conclusion, the students become lazy in the class because they can’t follow the lesson, they are affected by their own interest, and affected by family factors.