"Goodnight, husband" is the Engpsh equivalent of "晚安，老公".
This is a common phrase used in Engpsh to say "goodnight" to one's husband before going to bed. It is a popte and affectionate way to say goodnight and express love or affection towards one's husband.
Example:
"Goodnight, husband. Sleep well."
"Sweet dreams, my husband. Goodnight."
These phrases are commonly used in Engpsh-speaking countries and do not have a specific cultural origin.