Sharing a room means that it’s important to be considerate of the other person. If one of them comes home late they should enter quietly and try not to wake their roomie up. It’s also advisable to leave the lights off when they’re sleeping because they may wake up.
“My first roommate would come in at 3 in the morning and turn the lights on while I was sleeping,” Klymex reminisced. “When confronted be said I should “buy one of those masks people wear in airplanes.” This is a horrible attitude because it’s unfair and irrational.