Question: What does, 'night night', mean?
"Night night" is a informal way of saying "goodnight." It is often used when saying goodnight to children or to someone you are close to, such as a family member or friend. It is a shortened version of "goodnight" and is typically used as a way of expressing affection or warmth towards the person you are speaking to. Saying "night night" is a way of wishing someone a peaceful and restful night's sleep.