Door hangers are more important than you think. Imagine being sound asleep when suddenly someone knocks on your door or rings the bell, and wakes you up. That’s why hotels came up with this brilliant “do not disturb” door hanger idea, so that if a guest is busy or asleep, he’ll simply put out the door hanger to notify the staff/room service, but there’s more to door hangers than this, did you know that door hangers are used as a cheap marketing tool. It’s not only cost effective but also ensures that your audience will receive the message.