Preaching in night class- is it a necessary distraction?

Night class has become a religion in our various institutions and Uniben is no exception. Preaching in night class has also become some sort of a norm. My question is, is preaching while students are reading right? Religious and sentimental reasons aside, isn't this preaching serving as a sort of distraction as concentrating on one's books is already hard enough? If you think there is nothing wrong with the preaching, don't you think it should be regulated? Why will a student who has already seen 3 people preach within 3hours at the faculty of Law still go ahead to preach and cause a form of distraction? I personally believe that these student preachers should take into cognizance the fact that not all students are Christians and if everyone from different religious background decides to preach then the purpose of night class would be defeated. Because of our society's beliefs, preaching during night class has being accepted by students, but I don't believe this gives people the right to become a certain type f nuisance, especially during exam period! One preacher per class! What do you all think?