You shouldn't disturb your roommates at night.
Paul and Dane are in their dorm room at night, as Dane tries to get a good night's sleep because he has a test tomorrow.
Paul wants to listen to music.
Paul puts on a set of headphones and listens to his music in the dark.
Paul turns his stereo all the way up and rocks out for hours.
Dane gets a good night's sleep and so is well-rested for his test, which he does well on.
Dane can't get to sleep and ends up doing poorly on his test because he's so tired.