Nocturnal behavior in human being?

     Recently, I am having this unexplainable behavior. I stay up extremely late playing game, smoking, surfing web, writing blogs and stuff... and sleep more at day time. My body certainly feel really tired and weird when I am doing that. But I can't stop this unusual behaviors. I feel sleepy, yet I don't want to go to sleep. I feel like time is so limited while I am having so much things to do. I go to sleep at about 5:oo am when my mind is really unconscious and about to faint out. Will I end up being like nocturnal animals: sleep at day time and become active at night time?

     Last weekend, I went to a work at a Vietnamese restaurant. It is my part time job. I talked to a good friend of mine and I found out I am not the only person experience this nocturnal behavior. My friend is a good-looking strong Mexican young man. He worked there for only 3-4 days a week. And he would stay up all night playing PS game when he does not have to go to work on the next day. It also reminds me of an old friend. He would stay up all night playing the additive online game: World of Warcraft. 

     Is it the content of games and things people are spending time on really the main reason to cause the nocturnal behavior or is there something else? Am I trying to stretch out the time of one day? This is exactly what we do when we have so many things to do with so little amount of time available. Staying late working or playing on my computer helps me feel like I'm gaining extra hours for a day. I'm having more time to do what I'm doing.