The roommate who returns to the room last wins a point. That person must intend to go to bed or at least reside within his/her room. If neither roommate returns to the room that night, both roommates win a point.
The challenge can go on unofficially, or with both roommates actively participating and keeping tally on their whiteboard.
This is generally a BadIdea.
RachelRoley KathleenSchaefer ChrisSugino JohnathanAshley DevonStork EricStucky