My doubt about attitudes of postgraduate towards classes in our school

We have had our classes since one month ago,our university arranges about 8 courses in this term.My classmates did quite well in having our classes on time in the first week,however,as the time went by ,fewer and fewer people went to the classroom in the past time.What did they do during class and where are they?The answer :They spend most of their time sleeping in dormitory sa well as playing computers!My god!I am comfused why they waster so much time sleeping and playing electric game?It seems that what they do does not match their academic identity.
I wonder is this strange phenomenon common in you country?

We've had  started our classes since one month ago. This term, our university arranges about 8 courses in this term. My classmates did quite well in having our classes on time were all punctual for classes in the first week. However, as the time went by passes, fewer and fewer people went to the classroom in the past time attend the lessons. What did they do during classes and where are were they? The answer is: They spent most of their time sleeping in the dormitory as well as playing computers! My God! I am confused on why they wasted so much time sleeping and playing electric electronic games? It seems that what they do does not match their academic identity.
I wonder is this strange phenomenon common in your country too?

Note that after every punctuation, you need to space it. :)