* Formal: "Lelo oyo bompasi" (pronounced: lelo oyoo bom-pa-see)
* Informal: "Lelo oyo" (pronounced: lelo oyoo)
* Informal, with emphasis on sleep: "Lelo oyo, tolala" (pronounced: lelo oyoo, to-la-la)
The most common and informal way to say goodnight is simply "Lelo oyo".
Remember, Lingala is spoken in different regions of the Democratic Republic of Congo and the Republic of Congo, so there may be slight variations in pronunciation and vocabulary.