Formal:
* "Magandang gabi, mahal ko." (Literally: "Good evening, my love.") - This is a more formal way of saying good night.
* "Tulog na po, mahal ko." (Literally: "Sleep now, my love.") - This is also a formal way of saying good night, emphasizing respect.
Informal:
* "Goodnight, mahal ko." (Literally: "Goodnight, my love.") - This is a common and informal way of saying good night.
* "Tulog ka na, mahal ko." (Literally: "Sleep now, my love.") - This is a more affectionate way of saying good night.
* "Mahal kita. Goodnight." (Literally: "I love you. Goodnight.") - This is a very loving and romantic way of saying good night.
Other options:
* "Sweet dreams, mahal ko." (Literally: "Sweet dreams, my love.")
* "I love you. Sleep well." (Translated directly from English)
The best option for you will depend on the context and your relationship with the person you are speaking to.