When I was an undergrad I once stayed up all night to finish a programming assignment in my OS class. I then went to my morning class. After the class was over I went back to my dorm room to try to get a couple of hours sleep before the next class. But I couldn't sleep! And the reason was because I feared that I farted in my sleep and I didn't want my roommate to come back to the room with a girl. I was afraid that I would fart in my sleep while a girl was there. So I just layed in bed, trying to get to sleep but my fears wouldn't let me.