Un-able to stay awake??

It is safe to say that a number of SUNY Cortland students attempt to find a member of the opposite sex to hang out with from time to time. This is a normal human process and is not shameful at all, but what I don't understand is once you find that special person to spend some alone time with....why fall asleep??
This happened twice this weekend. Two of my roommates brought back respectable girls that seemed to be cool. One of my roommates....who's name I will disclose( but is known as a G) decided to invite his friend back, but before he could spend some time with her he felt the need to eat everything in our room. By the time he had finished a bag of popcorn,a cup of soup, and a bag of pop-tarts he was to sleepy to roll over and conversate....he simply went to sleep like a little baby. To make it even worse... the following night another one of my roommates decided to do almost the same thing. He also brought back a girl that seemed to be very nice....but before we knew it....he had already wrestled three rounds with her and we found him passed out with "socko" in his mouth.
I just don't understand this....young men( One of which is a G) and two pretty girls....why go to sleep so early???? It is funny...but is this the quality I will see from my roommates all year?