In Irish Gaelic it's oíche mhaith (agat) (taking leave/retirement to bed).
To one retiring, Slán codlata agat.
In Scottish Gaelic it is 'oidhche mhath leat.' good night to you.
The Gaelic for "Goodnight" is Oidche (night) mhath (good) and is pronounced eye-ha - vah
Go dtugaidh Dia oíche mhaith dhuit [dibh, plural].
You can say "lafi" to say goodnight in Mandinka.
In Berber, you can say "tanemirt" to say goodnight.
goodnight
"Goodnight".
goodnight!
In Fulani, you can say "Jaama wolof" to say goodnight.
In Pangasinan, you can say "napagtolak" to mean goodnight.
shab bekheyr
In Polish, you say "dobranoc" to wish someone goodnight.
In British English, you can say "goodnight" or "night" as a shorter version.