Good night is a phrase commonly used to bid farewell to someone before they go to sleep. However, there are many different ways to say good night depending on the situation or individual preference. Some synonyms include sweet dreams, sleep tight, have a good rest, rest well, sleep peacefully, nighty night, and pleasant dreams. These phrases can also be customized based on the people involved, such as saying "good night, my love" or "sleep well, little one." Whether it's a formal or casual setting, using alternative phrases to wish someone good night adds a personal touch and shows that you care about their well-being.