Formal:
* शुभ रात्रि (Shubh raatri): This is the most formal and polite way to say "Good night."
Informal:
* शुभ रात्रि (Shubh raatri): This is also an acceptable way to say "Good night" in informal situations.
* रात (Raat): This is a more casual way to say "Good night" and is often used among friends and family.
* रात मंगल (Raat mangal): This literally translates to "Good night," but it's more common to say "Raat" in informal settings.
Other options:
* स्वप्न सुंदर (Swapna sundar): This means "Sweet dreams" and is a very common way to end a conversation.
* आपका दिन शुभ हो (Aapka din shubh ho): This means "Have a good day" and is often said in the evening when you are about to say "Good night."
Ultimately, the best way to say "Good night" in Hindi depends on the context and your relationship with the person you are talking to.