How do you say “good night” in Arabic?

In Arabic, “Good night” is commonly said as:

تصبح على خير
(Tosbah ‘ala khair)

This phrase literally means “May you wake up to good (things)” and is the most commonly used expression when wishing someone a good night.

Alternatively, you can also say:

ليلة سعيدة
(Layla Sa’ida)
This means “Happy night.”

Both are polite and commonly used in Arabic-speaking countries!