Why do I fall asleep playing Tera Online?

[hollowkiss237]

Don't have any health/mental/psychological problems. I swear, every time I play this game, after maybe 10-20 minutes, I suddenly start getting tired, and falling asleep at the keyboard. I thought maybe it was something in the background sounds, or music, so turned it off. I don't have this problem with any other game. I could be bright eyed awake, but start playing this game---boom, snoring.
No, I don't like the game much, but I've never had a game I don't like put me to sleep. lol I mainly level a player to help my wife, where needed, since she likes the game. Almost capped.