求翻译：结果，因为不吃早餐，一些学生早上在课堂上睡觉，不能集中注意力，记忆力持续下降。这些不好的影响导致学生考试的成绩不好。是什么意思？

The results, because they do not eat breakfast, sleeping on some of the students in the classroom in the morning, cannot concentrate, memory decline. These bad bad effects lead to students ' test scores.