Proper Arabic
In Proper Arabic, the way to say good night is: Laylat al-khair (ليلة الخير)
However, there are many ways to say good night in the various Arabic dialects.
Tesbah ala al-khair (تصبح على الخير) and Derivatives:
This is a common thing said to another person before sleep.
(Egypt) [to a man] TisbaH 'ala kher
(Egypt) [to a woman] TisbaHi 'ala kher
(Egypt) [to a group] TisbaHu 'ala kher
(Egypt) [answer to a man] Wenta bikher
(Egypt) [answer to a woman] Wenti bikher
(Egypt) [answer to a group] Wantu bikher
Layla Sa3ida (ليلة سعيدة)
This is more commonly said when spiriting friends away for the night. (I.e. a party is ending, and you want to wish someone farewell at night.)
Tabat Laylatoka (طابت ليلتكَ) and Derivatives:
you say " tabat laylatoka" if you are talking to a male.
you say " tabat laylatoki " if you are talking to a female.
& you say " tabat laylatokom " if you are talking to two persons or more.
for a man, tesbah ala khair. for a women, tebahy ala khair.
Tusbih ala khairin ya azeezi
Literally it means "go with God" in Arabic and is commonly used to say goodbye or goodnight.
Tesbah ala khear and if you're talking to a female say tesbahy al khear
In Syrian Arabic, you can say "تصبح على خير" (Tisbah 'ala khair) for "goodnight." This phrase is commonly used to wish someone a good night. Another informal way to say goodnight is "ليلة سعيدة" (Layla sa'ida), which means "happy night."
In Berber, you can say "tanemirt" to say goodnight.
You can say "lafi" to say goodnight in Mandinka.
goodnight
goodnight!
"Goodnight".
In Fulani, you can say "Jaama wolof" to say goodnight.
In Pangasinan, you can say "napagtolak" to mean goodnight.